California Highways (www.cahighways.org): Route 20

Post 1964 Signage History

▸This segment is unchanged from its original 1963 routing.

The route between Colusa and Route 45 near Sycamore is signed as Route 45, although it is legislatively Route 20.

The route between Route 20 near Grass Valley and Route 20 near Nevada City is signed as Route 49, although it is legislatively Route 20.

The segments within Grass Valley (03-Nev-174-PM 9.6/10.2, 03-Nev-20-PM 12.9/13.3) were relinquished in August 2022, when the CTC authorized relinquishment of right of way in the city of Grass Valley along Route 174 (Colfax Avenue) from Route 20 to Race Street, along Route 20 on Tinloy Street from South Auburn Street to Bank Street, on Hansen Way from Colfax Avenue to East Bennett Street, and along Neal Street and South Auburn Street, under the terms and conditions as stated in the relinquishment agreement dated October 13, 2021 and determined to be in the best interest of the State. The relinquishment was authorized by Chapter 82, Statutes of 2020, which amended Section 474 of the Streets and Highways Code.
(Source: August 2022 CTC Agenda, Agenda Item 2.3c)

A discussion of the Highways to Boulevards program during the March 2022 CTC meeting identified the following segment(s) as potential Highways to Boulevards conversion projects: Route 20 in Lake County.
(Source: March 2022 CTC Agenda, Agenda Item 4.3)

Pre 1964 Signage History

020 coyote valley In 1934, Route 20 was signed from Jct. US 101 near Ukiah to Jct US 40 (now I-80) near Emigrant Gap, via Marysville and Nevada City. It was LRN 15. The segment from Williams to Colusa made part of the state highway system in the First Bond Act in 1909. The segments from Route 101 to Williams and from Colusa to I-80 were made part of the state highway system in the 1919 Third Bond Act.

By 1935, Route 20/LRN 15 can be seen terminating at US 101/LRN 1 via what is now Lake Mendocino Drive (shown on the 1935 California Division of Highways Map of Mendocino County). In 1957, there were plans to realing Route 20/LRN 15 north of Ukiah to make way for the Coyote Dam and Russian River Reservoir (Mendocino Lake Reservoir). The realignment of Route 20/LRN 15 was to be 4.2 miles in length and 32 feet in width. The planned opening date was no later than Marth 31st, 1958 due to anticipated inclement weather. By 1958, Route 20 was realigned north of Lake Mendocino, creating a full bypass of Ukiah.
(Source: Gribblenation Blog (Tom Fearer), “Former US Route 101 on State Street in Ukiah and the Highway Corridors of Ukiah”, March 2021)

In 1957, significant rerouting was required for Route 20. The project, 4.2 miles in length, consisted of a relocation of a two-lane highway around the Russian River Reservoir. This reservoir, approximately five miles in length and as much as a mile wide, was formed by the completion of Coyote Dam, constructed by the Guy F. Atkinson Company for the Corps of Engineers, U. S. Army. The previous Route 20 routing consisted of a substandard, two-lane highway through Coyote Valley and the East Branch Russian River Canyon. The portion located in the canyon had extremely poor alignment and was subject to heavy icing in the winter months. The new facility consists of the standard 32-foot all-paved section. The structural section provides for 0.25 foot of Type B and 0.05 foot of open graded plantmix surfacing on 0.50 foot of roadmixed CTB, 0.17 foot of untreated base, 1.00 foot of select material, and, in certain locations 1.00 foot of pervious subbase material. The grading is quite heavy and consists of 1,500,000 cubic yards of roadway excavation in addition to 13 fairly large stabilization trenches, involving some 75,000 cubic yards of trench excavation.

Rte 20 Laurel Dell Routing In 1954, a new routing for Route 20 between Laurel Dell Lake (Lower Blue Lake) (~ LAK 3.231) and 1/2 mi E of Tule Lake (Bachelor Valley) (~ LAK 5.187) was adopted. According to the article "a modern 2-lane highway will be built", The crossing of the arm of the Lower Dell Lake would require about 200' of fill, and the Scotts Valley Road intersection would be improved. The previous routing is clear from the Google satellite view.
(Source: Redwood Journal Press-Telegraph, 3/19/1954 via Joel Windmiller, 4/26/2023)

The portion of this route in Marysville was once part of Alt. US 40.

For a long time, the legislative definition contained special language about the bridge between Sutter and Colusa county, and how maintenance for said bridge devolved. That language was finally deleted in 1955.

Rte 20 Meridian Rerouting In 1956, a proposal for a future freeway routing of Route 20 near Meridian was presented. The segment runs from 4.5 mi E of Colusa to Drexler Road, E of Meridian, including provision for a new bridge over the Sacramento River near Meridian. The tentative routing begins 0.1 mi N of the junction of Sign Route 20 and Sign Route 45 and swings south with a new junction being made between the two highways in the vicinity of Sycamore-Cutoff Road and crosses the Sacramento River approx. 7,500' S of the existing crossing. After crossing the river, it passes to the immediate S of Meridian, crossing Meridian Road and connecting to the previous alignment just E of Meridian. From this point, to Drexler Road, it uses the present facility. This routing only appears to have been partially constructed: Steidlmayer Road appears to have been bypassed to near the Sycamore Cutoff, but the existing route seems to have been retained E of that point.
(Source: Independent-Herald, 12/13/1956, via Joel Windmiller, 2/23/2023)

Rte 20 Freeway near Rough and Ready In 1959, two freeway proposals for Route 20 near Grass Valley were discussed. The more direct Alternative A was selected over Alternative B that went through Rough and Ready. This routing was eventually constructed.
(Source: Sacramento Bee, 3/25/1959 via Joel Windmiller, 2/20/2023)

Status

US 101 near Capella to Route 29 W of Clear Lake

As of February 2000, the Route 20 corridor between Calpella (i.e., starting around MEN 33.348) to I-5 is a hot spot. Mendocino, Lake, and Colusa Counties have all agreed that they would like to see four lane road all along the corridor, which is considered a rural principal arterial. In Lake County, rather than upgrading Route 20 along the North shore of the lake, the principal arterials will be Route 29 and Route 53 along the South side of the lake. Project Study Reports in progress for the following:

Extending the Route 20 expressway NE of Ukiah into Lake County.
Extending the Route 29 freeway portion S from Lakeport to Kelseyville.
Upgrading Route 29 from Kelseyville to Lower Lake to 4-lane expressway
Building a bypass of Lower Lake starting on Route 29 and running NE to Route 53.
Upgrading the Route 53 Clearlake Expressway to freeway.
Construction of an interchange at Route 53 and Route 20.
Upgrading Route 20 to 4 lanes between the beginning of the Coast Range mountains E to I-5 at Williams.

Calpella 2 Bridge Replacements Project (01-Men-20 33.3/34.4)

Russian River Bridges (01-Men-20 33.3/34.4) In June 2019, the CTC approved the following scope amendment to the SHOPP: 01-Men-20 33.3/34.4 PPNO 4587 ProjID 0113000123. Near Ukiah, from east of Route 101 to east of Road 144 at Russian River Bridge and Overhead No. 10-0182 and Redwood Valley Undercrossing No. 10-0183. ~~Rehabilitate bridge deck.~~ Replace two bridges with a single bridge on a new alignment. Change scope to replace two bridges with one full length bridge on a new alignment. This requires new structures rather than deck replacement and performance is updated to show deck area of new bridge. Increase R/W support and capital for offsite mitigation and acquisition of three added parcels due to the new alignment and wider bridge. Increase construction support and capital due to scope changes and additional inspection required. Updated total cost: $45,210K
(Source: June 2019 CTC Minutes, Agenda Item 2.1a.(1) Scope Item 16)

In December 2019, the CTC had the following SHOPP amendment on its agenda: 01-Men-20 33.3/34.4 PPNO 4587 Proj ID 0113000123 EA 0E090. Route 20 Near Ukiah, from ~~east of Route 101~~ North Calpella Overcrossing to 0.5 mile east of County Road 144 at Russian River Bridge and Overhead No. 10-0182 and Redwood Valley Undercrossing No. 10-0183. Replace two bridges with a single bridge on a new alignment. Total cost: ~~$45,210K~~ $46,488K. Note: Update description to reflect more accurate project location. Reduce R/W capital as offsite oak mitigation is no longer anticipated. Reduce construction support to account for reduction in escalation rates. Increase construction capital to address additional paving due to increased shoulder width and overlay on the local road below the overpass, and increase in erosion control and drainage work.
(Source: December 2019 CTC Agenda, Item 2.1a.(1d) Item 5)

The 2020 SHOPP, approved in May 2020, included the following Bridge Preservation item of interest (carried over from the 2018 SHOPP): 01-Mendocino-20 PM 33.3/34.4 PPNO 4587 Proj ID 0113000123 EA 0E090. Route 20 near Ukiah, from North Calpella Overcrossing to 0.5 mile east of County Road 144 at Russian River Bridge and Overhead No. 10-0182 and Redwood Valley Undercrossing No. 10-0183. Replace two bridges with a single bridge on a new alignment. Programmed in FY20-21, with construction scheduled to start in October 2021. Total project cost is $48,806K, with $35,355K being capital (const and right of way) and $13,451K being support (engineering, environmental, etc.).
(Source: 2020 Approved SHOPP a/o May 2020)

In June 2020, the CTC approved the Calpella 2 Bridge Replacements Project on Route 20 in Mendocino County, which will replace two bridges with one bridge in Mendocino County. (PPNO 4587)
The project will perform a complete bridge replacement of the Russian River Bridge and Redwood Valley Undercrossing on a new alignment, located along Route 20 near Ukiah. To ensure traffic would not be significantly impeded during construction, the existing structures and alignment would remain in place during construction. This project is currently programmed in the 2018 State Highway Operation Protection Program (SHOPP) for a total of $48,806,000 which includes Construction (capital and support) and Right of Way (capital and support). Construction is estimated to begin in 2021-2022. The scope, as described for the preferred alternative, is consistent with the project scope programmed by the Commission in the 2018 SHOPP.
(Source: June 2020 CTC Agenda, Agenda Item 2.2c.(1))

In June 2020, the CTC approved the following support allocation for this project: 01-Men-20 33.3/34.4 PPNO 4587 ProjID 0113000123 EA 0E090. Route 20 near Ukiah, from North Calpella Overcrossing to 0.5 mile east of County Road 144 at Russian River Bridge and Overhead No. 10-0182 and Redwood Valley Undercrossing No. 10-0183. Replace two bridges with a single bridge on a new alignment. Allocation: PS&E $3,129,000; R/W Sup $301,000
(Source: June 2020 CTC Agenda, Agenda Item 2.5b.(2b) #3)

In August 2021, the CTC approved the following SHOPP amendment: 01-Men-20 33.3/34.4 PPNO 01-4587 ProjID 0113000123 EA 0E090. Route 20 Near Ukiah, from North Calpella Overcrossing to 0.5 mile east of County Road 144 at Russian River Bridge and Overhead № 10-0182 and Redwood Valley Undercrossing № 10-0183. Replace two bridges with a single bridge on a new alignment. (Concurrent CONST and CON ENG allocation under Resolution FP-21-04; August 2021.) Note: Split off mitigation project EA 0E091/PPNO 01-4587M for onsite revegetation and monitoring from parent project EA 0E090/PPNO 01-4587. Updated financials ($ × 1,000): Con Sup $7,934 ⇒ $7,534; Const Cap $33,291 ⇒ $32,464; Total $48,806 ⇒ $47,579.
(Source: August 2021 CTC Agenda, Agenda Item 2.1a.(1d) #1)

Also in August 2021, the CTC approved the following construction phase allocation: $37,849,000. 01-Men-20 33.3/34.4. PPNO 01-4587; ProjID 0113000123; EA 0E090. Route 20 Near Ukiah, from North Calpella Overcrossing to 0.5 mile east of County Road 144 at Russian River Bridge and Overhead № 10-0182 and Redwood Valley Undercrossing № 10-0183. Outcome/Output: Replace two bridges with a single bridge on a new alignment. Allocation: CON ENG $7,534,000 CONST $32,464,000. (Future consideration of funding approved under Resolution E-20-42; June 2020.) (As part of this allocation request, the Department is requesting to extend the completion of construction an additional 6 months beyond the 36 month deadline.) (Six month time extension for CONST and CON ENG approved under Waiver 21-59; June 2021.) (Concurrent amendment under SHOPP Amendment 20H-010; August 2021.)
(Source: August 2021 CTC Agenda, Agenda Item 2.5b.(1) #6)

In March 2018, the CTC approved $3,028,000 in SHOPP funding for: Mendocino 01-Men-20 R37.8/R38.3 On Route 20 Near Calpella, from 0.1 mile west of Cold Creek Bridge #1 to Cold Creek Bridge #2. Outcome/Output: Improve safety at the intersection of Potter Valley Road and Route 20 by adding an eastbound acceleration lane, installing lighting and rumble strip, improving drainage, and realigning the angle of the intersection. This project will reduce the number and severity of collisions.
(Source: March 2018 CTC Agenda Item 2.5f)

Blue Lakes Curve Improvement (01-Lake-20 PM 2.0/2.8)

Blue Lakes Curve Improvement (01-Lake-20 PM 2.0/2.8) In December 2018, the CTC allocated $1,986,000 of support costs for the advancement of a project on Route 20 in Lake County near Upper Lake between Irvine Avenue and Mid Lake Road (~ LAK 2.563 to LAK 2.668). The proposed project plans to improve curves and widen shoulders on Route 20. The estimated total cost of the project is $24,929,000, with construction expected to start 7/7/2022.
(Source: Redheaded Blackbelt, 12/10/2018; December2018 CTC Minutes, Agenda Item 2.1a(1), Item 18; December 2018 CTC Minutes, Agenda Item 2.5b(2a), Item 3)

The 2020 SHOPP, approved in May 2020, included the following Collision Reduction item of interest (carried over from the 2018 SHOPP): 01-Lake-20 PM 2.0/2.8 PPNO 3123 Proj ID 0118000117 EA 0H840. Route 20 near Upper Lake, from 0.6 mile west of Irvine Avenue to 0.1 mile east of Mid Lake Road. Improve curves and widen shoulders. Programmed in FY21-22, with construction scheduled to start in July 2022. Total project cost is $24,929K, with $15,774K being capital (const and right of way) and $9,155K being support (engineering, environmental, etc.),
(Source: 2020 Approved SHOPP a/o May 2020)

In December 2020, the CTC approved for future consideration of funding the following project for which a Negative Declaration (ND) has been completed: Route 20 in Lake County (01-Lak-20, PM 2.0/2.8). Correct curves on Route 20 in Lake County. (PPNO 3123) This project is located on Route 20 between post miles 2.0 and 2.8 in Lake County. The proposed project would improve an existing curve, install two retaining walls, widen and pave existing shoulders, install guardrail and terminal systems, excavate a sight bench, replace and extend culverts, relocate overhead utilities, and replace centerline and shoulder rumble strips. This project is fully funded and is currently programmed in the 2020 State Highway Operation and Protection Program (SHOPP) for a total of $24,929,000 which includes Construction (capital and support) and Right of Way (capital and support). Construction is estimated to begin FY 2021-2022. The scope, as described for the preferred alternative, is consistent with the project scope programmed by the Commission in the 2020 SHOPP.
(Source: December 2020 CTC Agenda, Agenda Item 2.2c.(1))

In December 2020, the CTC approved the following SHOPP Support Phase allocation: $2,600,000 ($2,373,000 programmed) for PS&E and $445,000 ($401,000 programmed) for R/W Sup for 01-Lak-20 PM 2.0/2.8. PPNO 01-3123 ProjID 0118000117 EA 0H840. Route 20 Near Upper Lake, from 0.6 mile west of Irvine Avenue to 0.1 mile east of Mid Lake Road. Improve curves and widen shoulders. (Concurrent consideration of funding under Resolution E-20-110; December 2020.)
(Source: December 2020 CTC Agenda, Agenda Item 2.5b.(2a) #1)

In January 2023, the CTC received notice of the following emergency G-03-10 allocation: $20,864,000. 01-Lak-20 2.0/2.8. PPNO 01-3123; ProjID 0118000117; EA 0H840. Route 20 Near Upper Lake, from 0.6 mile west of Irvine Avenue to 0.1 mile east of Mid Lake Road. Outcome/Output: Improve safety by realigning curve, widen shoulders, construct retaining wall, replace drainage systems, reconstruct roadway, and install guardrail. This project will reduce the number and severity of collisions. Allocation: CON ENG $4,395,000; CONST $15,214,000. Previous engineering allocations budgeted (expended): PA&ED $1,986,000 ($1,976,746); PS&E $2,600,000 ($2,336,223); R/W Sup $689,500 ($438,067). CEQA - ND, 9/18/2020; Re-validation 11/30/2022; NEPA - CE, 9/18/2020; Re-validation 11/30/2022; Future consideration of funding approved under Resolution E-20-110; December 2020. Twelve month allocation time extension for CONST and CON ENG approved under Waiver 22-73; June 2022. Allocation Date: 12/12/2022.
(Source: January 2023 CTC Agenda, Agenda Item 2.5f.(3) #1)

Witter Springs Road Widening (LAK 5.1/5.8)

Rte 20 Witter Springs Widening In June 2017, the CTC added the following into the SHOPP: 01-Lak-20 5.1/5.7 On Route 20: Near Upper Lake, from 0.4 mile west to 0.2 mile east of Witter Springs Road. Curve improvement, shoulder widening, and add left-turn pocket and rumble strips. $234,000 (R/W) $7,441,000 (C) PA&ED: 04/08/2019 R/W: 04/01/2020 RTL: 04/15/2020 BC: 12/03/2020. It was also included in the final adopted 2018 SHOPP in March 2018: PPNO 4647. 01-Lake-20 5.1/5.7. Total Project Cost: $13,029K.

In May 2019, the CTC approved the following project for future consideration of funding: for which a Mitigated Negative Declaration (MND) has been completed: 01-Lak-20, PM 5.10/5.80 Route 20 in Lake County. Widen shoulders on a portion of Route 20 near the town of Upper Lake. (PPNO 4647). This project is located on Route 20 near Upper Lake, east of Witter Springs Road in Lake County. The project proposes to widen shoulders in both directions of Route 20, increase existing curve radius and add an eastbound left turn lane and a westbound right turn lane. This project proposes to address the frequency and severity of collisions at this project location. The proposed project will improve the current narrow shoulders, limited clear recovery zones, insufficient stopping distances, non-standard curve radius and nonstandard superelevation, as well as improve overall safety for motorists. The project is fully funded and programmed in the 2018 State Highway Operation Protection Program (SHOPP) for an estimated total of $13.0 million, which includes Construction (capital and support) and Right-of-Way (capital and support). Construction is estimated to begin in Fiscal Year 2020-21. The scope, as described for the preferred alternative, is consistent with the project scope programmed by the Commission in the 2018 SHOPP. The CTC also approved the following SHOPP Amendment: 01-Lak-20 ~~5.1/5.7~~ 5.1/5.8 PPNO 4647. ProjID 0116000170. On Route 20 Near Upper Lake, from 0.4 mile west to ~~0.2~~ 0.3 mile east of Witter Springs Road. Curve improvement, shoulder widening, and add left-turn pocket and rumble strips. Note: Change in project limits is to accommodate a standard curve radius and eliminate the need for retaining walls. Additional construction capital is needed due to increase in earthwork quantities and increase in unit prices for excavation. Additional R/W capital is needed due to encroachment into a wetland area requiring additional mitigation, permits, and temporary construction easements. Improved design also requires one additional parcel. Total est. cost now: $14,504K. Lastly, the CTC approved the following SHOPP Support Phase allocation: 01-Lak-20 5.1/5.8. Route 20 near Upper Lake, from 0.4 mile west to 0.3 mile east of Witter Springs Road. Curve improvement, shoulder widening, and add left turn pocket and rumble strips. (Concurrent consideration of funding under Resolution E-19-36; May 2019.) (Concurrent amendment under SHOPP Amendment 18H-009.) PPNO 4647. ProjID 0116000170. PS&E $1,877,000. R/W Sup $144,000.
(Source: May 2019 CTC Agenda Item 2.2c.(1), 2.1a.(1) Amend Item 6; Agenda Item 2.5b.(2a) Item 3)

In August 2020, the CTC amended this SHOPP project: 01-Lak-20 PM 5.1/5.8 PPNO 4647 ProjID 0116000170 EA 0G330. Route 20 Near Upper Lake, from 0.4 mile west to 0.3 mile east of Witter Springs Road. Curve improvement, shoulder widening, and add left-turn pocket and rumble strips. Changes to Con Sup from $1,870K to $1,577K, and to Const Cap from $8,316K to $8,131K. Note: Split environmental mitigation work from this project into EA OG331/PPNO 01-4647M.
(Source: August 2020 CTC Agenda, Agenda Item 2.1a.(1d) #2)

Related to the above, in August 2020 the CTC also approved the following financial allocation for construction and construction support: $9,498,000 01-Lak-20 PM 5.1/5.8. PPNO 01-4647. ProjID 0116000170 EA 0G330. Route 20 Near Upper Lake, from 0.4 mile west to 0.3 mile east of Witter Springs Road. Outcome/Output: Improve safety by realigning curves, widening shoulders, and constructing rumble strips. This project will reduce the number and severity of collisions.
(Source: August 2020 CTC Agenda, Agenda Item 2.5b.(1) #5)

Route 29 W of Clear Lake to Route 53 E of Clear Lake

Morrison Creek Bridge No. 14-0004 (LAK PM 16.81)

In June 2019, the CTC approved the following SHOPP scope amendment: 01-Lak-20 ~~Var~~ 9.4 PPNO 3098 ProjID 0113000122. Route 20 Near Upper Lake, at Polk Jones Cattlepass Bridge No. 14-0034 (PM 9.41) ~~and Morrison Creek Bridge No. 14-0004 (PM 16.81)~~; also, on Route 29 at Manning Creek Bridge No. 14-0067 (PM R38.91). Replace and upgrade bridge rails ~~and widen one bridge~~. The need to widen Morrison Creek Bridge to provide raised pedestrian sidewalks on both sides requires cultural analysis, resulting in a schedule delay. Transfer the scope and associated cost and performance of this bridge to project EA 0E081/PPNO 01-3130, which has a schedule that aligns with this delay. Adjusted total cost: $3,775K
(Source: June 2019 CTC Minutes, Agenda Item 2.1a.(1) Scope Item 7)

In June 2019, the CTC also approved the following SHOPP scope amendment: 01-Lak-29 50.8 PPNO 3130 ProjID 0118000172. Route 29 Near Upper Lake, at Robinson Creek Bridge No. 14 -0030 (PM 50.82); also on Route 175 at Kelsey Creek Bridge No. 14-0044 (PM 19.48); also on Route 20 at Morrison Creek Bridge No. 14-0004 (PM 16.81). Widen bridge and upgrade bridge rails at Robinson Creek Bridge and Morrison Creek Bridge, and replace existing Kelsey Creek Bridge. Remove Morrison Creek Bridge from project EA 0E080/PPNO 01-3098 and add to this project. The need for cultural analysis delayed the Morrison Creek Bridge delivery schedule and it now better aligns with this project. Further cost increases are associated with additional piles, retaining wall, and required environmental mitigation. Updated total cost: $10,833K.
(Source: June 2019 CTC Minutes, Agenda Item 2.1a.(1) Scope Item 11)

In August 2020, the CTC approved for future consideration of funding a project is located on Route 20 (01-Lak-20, PM 16.81), Route 29 (01-Lak-29, PM 50.82), and Route 175 (01-Lak-175, PM 19.48) at various locations in Lake County. The Department proposes to widen and upgrade bridge rails at Robinson Creek Bridge and Morrison Creek Bridge, and replace existing Kelsey Creek Bridge. This project is fully funded and is currently programmed in the 2020 State Highway Operation Protection Program (SHOPP) for a total of $14,076,000 which includes Construction (capital and support) and Right of Way (capital and support). Construction is estimated to begin in Fiscal Year 2021-2022. The scope, as described for the preferred alternative, is consistent with the project scope programmed by the Commission in the 2020 SHOPP.
(Source: August 2020 CTC Agenda, Agenda Item 2.2c.(1))

Related to the previous item, also in August 2020 the CTC approved the following financial allocation: $2,220,000 for PS&E; $223,000 for R/W Support. 01-Lak-29 PM 50.8. PPNO 3130 ProjID 0118000172 EA 0E081. Route 29 Near Upper Lake, at Robinson Creek Bridge No. 14-0030 (PM 50.82); also on Route 175 at Kelsey Creek Bridge No. 14-0044 (PM 19.48); also on Route 20 at Morrison Creek Bridge No. 14-0004 (PM 16.81). Widen bridge and upgrade bridge rails at Robinson Creek Bridge and Morrison Creek Bridge, and replace existing Kelsey Creek Bridge.
(Source: August 2020 CTC Agenda, Agenda Item 2.5b.(2b) #1)

In March 2012, it was reported that Caltrans has begun construction of a roundabout at Nice-Lucerne Cutoff Road (~ LAK 12.138) in an attempt to improve safety.

In October 2017, the CTC approved relinquishment of right of way in the county of Lake along Route 20 at Nice-Lucerne Cutoff and Pyle Road (01-Lak-20-PM 12.2), consisting of collateral facilities. The County, by cooperative agreement dated February 152011 agreed to waive the 90-day notice requirement and accept title upon relinquishment by the State.

In January 2010, the CTC approved relinquishment of right of Way along Route 20 in the town of Nice, county of Lake, at Collier Avenue (~ LAK 12.934), consisting of a reconstructed and relocated county road..

In August 2009, the CTC approved relinquishment of right of way in the county of Lake along Route 20 just west of Route 53, consisting of a frontage road (~ LAK 31.236).

In November 2019, Caltrans reported that the roundabout at the Route 20 / Route 53 intersection in Lake County (~ LAK 31.587) was opening to traffic. The roundabout is expected to reduce the total number of collisions by 28% and collisions with injuries are projected to drop 74%.
(Source: Caltrans District 1 Tweet, 11/5/2019)

Route 53 E of Clear Lake to I-5 near Williams

Clearlake Oaks to Walker Ridge Curve Realignment (01-Lak-20 R43.9/R44.2)

In August 2023, the CTC amended the 2022 SHOPP to add the following project: 01-Lak-20 R43.9/R44.2. PPNO 01-3217; ProjID 0122000135; EA 0M310. Route 20 Near Clearlake Oaks, from 0.3 mile east to 0.6 mile east of Walker Ridge Road. Realign curve, widen shoulders, and construct rumble strips. Concurrent COS allocation under Resolution FP-23-16; August 2023. Allocation ($ × 1,000): PA&ED $1,592; PS&E $1,391; R/W Sup $391; ⊘Con Sup $1,684; ⊘R/W Cap $46; ⊘Const Cap $6,956; TOTAL $12,060. FY23-24 through FY26-27. Begin Const: 8/24/2027.
(Source: August 2023 CTC Agenda, Agenda Item 2.2a.(1a) #41)

In August 2023, the CTC approved the following SHOPP Pre-Construction Phase (environmental support, design, and R/W support) allocation: $1,592,000. 01-Lak-20 R43.9/R44.2. PPNO 01-2535; ProjID 0122000135; EA 0M310. Route 20 Near Clearlake Oaks, from 0.3 mile east to 0.6 mile east of Walker Ridge Road. Realign curve, widen shoulders, and construct rumble strips. Concurrent Amendment under SHOPP Amendment 22H-011; August 2023. Allocation: PA&ED $1,592,000.
(Source: August 2023 CTC Agenda, Agenda Item 2.5b.(2a) #3)

In May 2015, the CTC authorized relinquishment of right of way in the county of Colusa along Route 20 at Bear Valley Road (~ COL 3.343, near Wilbur Springs, near the intersection with Route 16), consisting of a reconstructed county road.

In August 2011, the CTC approved $277,000 in SHOPP funding, programmed in Fiscal Years 2012-13 and 2013-14, for repairs in Nevada, Sacramento and Yolo Counties on Route 5, Route 20 and US 50 at various locations that will upgrade crash cushions and guardrail to meet the current National Cooperative Highway Research Program (NCHRP) 350 standards and improve safety.

In August 2011, the CTC approved $8,800,000 in SHOPP funding for repairs near Williams, from 10 miles west of Williams (~ COL R12.272) to 1.5 miles east of Route 5 (~ COL R23.772), that will rehabilitate 26.2 lane miles of roadway to improve the ride quality, prevent further deterioration of the traveling surface, minimize costly roadway repairs and extend the pavement service life.

E-Streets Complete Streets Project

In December 2022, it was reported that the CTC approved $9.3 million for the E Street Complete Streets Project in Williams. The project addresses the intersection of E and Eleventh streets, including F Street, where there are various conflict points for drivers due to cross traffic and speeding, failure to stop at stop signs, collisions, and pedestrian and bicyclist safety. To alleviate these problems, city officials are looking to install a roundabout at the intersection. The E Street project is still in the design phase and several design options for the corridor are being considered with various other features including turn lanes, bike paths, pedestrian walkways, curbs and gutters, lighting and parking. The timeline for the project’s necessary milestones – which includes an environmental study, possibly acquiring property, design and bidding – will take a couple of years. Construction will likely not begin until 2025.
(Source: Appeal Democrat, 12/16/2022)

In November 2010, it was reported that Caltrans had completed construction of the $7.1 million project at the Route 20/I-5 junction in Williams (~ COL R21.949). The project was financed by the American Recovery and Reinvestment Act of 2009. The project reconstructed and stabilized approximately two miles of embankment slopes at the junction; in addition, a mile-long safety guardrail was installed, and the highway was resurfaced to give motorists a smoother, safer ride.

I-5 near Williams to Route 70 near Yuba City

Husted Road Interchange (~ COL T23.197)

Note: Some of this discussion relates to former Route 20, on E Street in Williams.

In December 2011, it was reported that the City of Williams is lobbying for a new truck-friendly intersection on Route 20, between Husted Road and I-5. The goal is getting access to the highway at what would be an extension of Margurite Street north to the highway. Margurite currently runs north from E Street to the new Woodland Community College facility, and dead ends at Ella, which runs east to Husted.
(Source: Colusa Sun-Times)

SR 20 Williams Project In October 2014, the CTC approved a future road connection to I-5 as part of a project related to Route 20. The project is located approximately 2,000 feet east of the I-5/Route 20 interchange in the City of Williams in Colusa County (~ COL T23.197). The project will create a new public road connection between the I-5 northbound off-ramp and Husted Road, construct improvements on Route 20 for turning movements, extend Margurite Street 3,200 feet from Ella Street to Route 20, and install a concrete culvert and drainage for the new segment of Margurite Street. As a result of this project the designation of Route 20 between I-5 and Husted Road will change from “freeway” to “controlled access expressway”. Impacts that require mitigation measures to be reduced to a less than significant level relate to Transportation & Traffic, Cultural Resources, Paleontology, Air Quality, Noise, Biological Resources and Climate Change. Mitigation measures include, but are not limited to: preparation and implementation of a traffic management plan, monitoring efforts for archaeological and paleontological artifacts during construction including measures to address the inadvertent discovery of cultural or paleontological resources, development and implementation of a lead compliance plan, measures to reduce noise, dust and emissions from construction equipment and operations, implementation of erosion control and stormwater pollution prevention measures, preconstruction surveys and establishment of buffer zones and other avoidance and compensatory measures to minimize impacts to nesting birds, the Swainson’s Hawk, the Burrowing Owl, and the Giant Garter Snake, and measures to minimize the spread of invasive plant species. The project is estimated to cost $6,860,000 and is fully funded through construction with STIP ($3,500,000) and Local ($3,360,000) funds. Construction is estimated to begin in fiscal year 2014/15.

As part of this project, the City of Williams (City) has proposed (and the CTC approved, in December 2014) construction of a new public road connection to Route 20 at Marguerite Street between the I-5 northbound off ramp and Husted Road (~ COL R22.686). The City’s General Plan Update (GPU), adopted in June 2012, identifies this new local road intersection with Route 20. Zoning changes allow for commercial and industrial development within the zoned business park along Marguerite Street. The new connection would improve traffic circulation and facilitate economic development opportunities for the commercial and business park development in the northeast section of the City. It would also allow for expedient emergency vehicle response to the business park. This section of Route 20 is a two-lane urban route within the city’s limits and continues as a rural route to the east and west of the City. Historically, there has been little development within the city; however, commercial development has been approved for construction in the 2015 fiscal year and more is expected to occur in the near term east of I-5 near the proposed new connection. The Department’s 2013 Route 20 Transportation Concept Report calls for a four-lane expressway as the ultimate facility type for this segment of Route 20 east of I-5. In Colusa County, conversion of Route 20 east of I-5 to a freeway is not anticipated to occur within the next 20 years (e.g., before 2034). Accordingly, District 3, per letter dated May 8, 2014, requested the recategorization of Route 20 from freeway to controlled access highway. This was approved on May 13, 2014. Additionally, in 2011, District 3 reviewed the City’s traffic studies associated with the extension of Marguerite Street and its proposed connection to Route 20. District 3 did not find any evidence that their request with full build out of the land use would negatively affect traffic operations along Route 20 or I-5. According to the approved traffic studies, the Route 20 proposed T intersection at Marguerite Street would only require stop traffic signs at this time. A traffic signal will be installed if warranted in future years.

In October 2022, the draft FSTIP included the following project: State Route 20 & Margurite Street Intersection Impro. In the City of Williams, on Route 20 at the Margurite Street intersection. Construct intersection control improvements (roundabout or traffic signal, TBD). It looks like $266 (presumably, ×$1000), with $100 in FFY23 and $166 in FFY25, all for planning and engineering.
(Source: Draft FSTIP, 10/2022)

In May 2023, the CTC was noticed of an amendment that would move COVID Regional Improvement Funds to program funding on the following project: State Route 20 & Margurite Street Intersection Improvement Project. PPNO 03-3204. 03-COL-20 ~ COL R22.506. In the City of Williams, on Route 20 at the Margurite Street intersection: Construct intersection control improvements (roundabout or traffic signal, TBD). Programmed funding: PS&E 166K. This funding was approved at the June 2023 meeting.
(Source: May 2023 CTC Agenda, Agenda Item 2.1b.(1); June 2023 CTC Agenda, Agenda Item 2.1a.(3))

In December 2016, the CTC approved for future consideration of funding a project in Colusa County that will remove and reconstruct the roadway to accommodate two 12-foot wide lanes, two 10-foot wide shoulders, new 12-foot wide turn lanes, Americans with Disabilities Act compliant sidewalks, improved drainage facilities, and other upgrades on Route 20 in the City of Colusa (03-Col-20, PM 31.8/32.8), from roughly Market and 1st to Bridge and Butte Vista Drive. The project is programmed in the 2016 State Highway Operation and Protection Program. The total programmed amount is $13,500,000 for capital and support. Construction is estimated to begin in Fiscal Year 2017-18. The scope, as described for the preferred alternative, is consistent with the project scope programmed by the Commission in the 2016 State Highway Operation and Protection Program.

In February 2006, the CTC received a report of no environmental impact for a project to rehabilitate the roadbed between Butte Vista Way in Colusa County (~ COL 32.785) to Hageman Road in Sutter County (~ SUT 2.711) between Meridian and Tarke.

In December 2005, the CTC considered relinquishment of right of way in the County of Sutter, between Hageman Road (~ SUT 2.711) and West Butte Road (~ SUT 5.014), consisting of reconstructed and relocated county roads, frontage roads, cul-de-sacs, and a bridge.

In August 2005, the CTC considered vacation of the right of way in the County of Sutter, between North Tarke Road (~ SUT 4.217) and West Butte Road (~ SUT 5.014), consisting of highway right of way easement no longer needed for State highway purposes.

In March 2017, the CTC approved for future consideration of funding a project located in Sutter County that proposes to rehabilitate pavement and widen shoulders on Route 20 (03-Sut-20, PM 5.0/11.3). In addition, the Wadsworth Canal Bridge No. 18-0003 will be replaced. The proposed project will meet current design standards and extend its service life. This project is programmed in the 2016 SHOPP for $30,765,000 in Construction (capital and support) and Right of Way (capital and support). Construction is estimated to beginning in Fiscal Year 2017-18. The scope, as described for the preferred alternative, is consistent with the project scope programmed by the Commission in the 2016 State Highway Operation and Protection Program.

In June 2016, it was reported that Caltrans held an open house to discuss improvement plans for a section of Route 20 in Sutter County west of Yuba City. Major improvements on the $25 million Sutter bypass project, a 6.3 mile section of Route 20 between West Butte Road (~ SUT 5.014) and Lytle Road (~ SUT 11.368), includes realigning the highway at Wadsworth Canal, removing and demolishing the existing Wadsworth Canal Bridge and building a new one just north of the existing site, and widening the shoulders along the Route 20 to accommodate a bike route.
(Source: Appeal-Democrat, 6/17/2016)

In December 2011, the CTC approved for future consideration of funding a project in Sutter County that will construct a new public road connection to Route 20 at Western Parkway (~ SUT 13.082) between Township Road and George Washington Boulevard in Yuba City. The project is entirely funded with local dollars. The project will need an approval for a new public road connection from the Commission. The total estimated cost is $2,570,000. Construction is estimated to begin in Fiscal Year 2010-11. The project will mitigate potential impacts to water quality/storm water runoff to a less than significant level. Water quality impacts will be mitigated through implementation of BMPs. The City of Yuba City is the CEQA lead agency for the project and all mitigation measures are the responsibility of Yuba City.

Dry Creek Bridge (03-Yub-20, PM 13.30/R17.80)

In January 2018, the CTC approved for future consideration of funding the following project for which a Mitigated Negative Declaration (MND) has been completed: Route 20 (03-Yub-20, PM 13.30/R17.80) in Yuba County: Construct roadway improvements and replace an existing bridge on Route 20 near the city of Marysville. (PPNO 9579) The project is located east of the city of Marysville, from Marysville Road to the Yuba River and proposes to widen shoulders, realign a portion of Route 20 and replace Dry Creek Bridge (Bridge No. 16-0010). This project is intended to bring the highway alignment up to current design standards and extend the service life of the pavement. Also, replacing the Dry Creek Bridge will allow Route 20 to have full permit loads for vehicles traveling from Marysville to Grass Valley. The project is programmed in the 2016 SHOPP and is estimated to cost $45 million. Construction is estimated to begin in Fiscal Year 2020-21. The scope, as described for the preferred alternative, is consistent with the project scope programmed by the Commission in the 2016 SHOPP.
(Source: CTC Agenda, January 2018, Agenda Item 2.2c(1))

In September 2021, it was reported that traffic has been shifted to the newly constructed Dry Creek Bridge on Route 20 in the Browns Valley area of Yuba County. The traffic shift allows the contractor to start demolishing the old bridge before the rainy season begins. In the meantime, crews are scheduled to begin major paving work along the Route 20 corridor between Marysville Road and the Parks Bar Bridge.
(Source: Lake County News, 9/24/2021)

In October 2022, it was reported that after more than two years of construction, the Dry Creek Bridge renovation project in Yuba County has been completed. Officials with Caltrans held a ribbon cutting ceremony in early October 2022 to commemorate the completion of the project on Highway 20 in Browns Valley, along with other road projects that concurrently developed. The Browns Valley project is the last of five major projects to be completed along Route 20. The five-mile section between Marysville Road and Timbuctoo Place was renovated and rehabilitated in order to provide wider lanes and shoulders to give commercial and recreational drivers more space to travel and pull off from the road. Other renovations include long-lasting, smoother pavement, upgraded facility standards, truck climbing walls, a wildlife undercrossing and increased sight distance for motorists. A turning lane was also added near the bridge to allow for safer ingress and egress into the road. The $65.5 million dollar project included nearly $5 million in funding from the 2017 Road Repair and Accountability Act.
(Source: Yahoo!News/Appeal Democrat, 10/7/2022)

Roadway Improvements near Lower Smartsville Road (03-YUB-20 R18.0/20.3)

In January 2018, the CTC approved for future consideration of funding the following project for which a Mitigated Negative Declaration (MND) has been completed: Route 20 (03-Yub-20, PM R18.07/20.25) in Yuba County: Construct roadway improvements on a portion of Route 20 near the town of Smartsville. (PPNO 9590). The project is located near the town of Smartsville along Route 20 in Yuba County. The project proposes to improve the roadway’s horizontal and vertical alignment, widen shoulders and add turn pockets from the Yuba River Bridge to the east of Lower Smartsville Road. The project is fully funded and programmed in the 2016 SHOPP for an estimated total of $67.3 million, which includes Construction (capital and support) and Right-of-Way (capital and support). Construction is estimated to begin in Fiscal Year 2020-21. The scope, as described for the preferred alternative, is consistent with the project scope programmed by the Commission in the 2016 SHOPP.
(Source: CTC Agenda, January 2018, Agenda Item 2.2c(1))

The following project was included in the final adopted 2018 SHOPP in March 2018: PPNO 9590. 03-Yuba-20 R18.0/20.3. Route 20 Near Smartsville, from the Yuba River Bridge to east of Smartsville Road. Realign and widen roadway. Begin Con: 12/1/2019. Total Project Cost: $67,321K.

In June 2019, the CTC approved following construction allocation: $61,678,000 03-Yuba-20 R18.1/20.1 ProjID 0313000020. Route 20 Near Smartsville, from the Yuba River Bridge to 0.1 mile east of Smartville Road. Realign roadway, provide standard shoulders, extend existing eastbound truck climbing lane, and add left turn lanes. This project will reduce the number and severity of collisions. Const. $54,678,000 Const. Engr. $7,000,000
(Source: June 2019 CTC Minutes, Agenda Item 2.5b.(1) Item 9)

In November 2020, it was reported that crews from Flatiron Construction are making significant progress on the $54 million Route 20 Timbuctoo Roadway Project taking place a half-mile east of the Yuba River in eastern Yuba County, Calif. The project, financed by state and federal dollars, began in February 2020, with delivery anticipated in September 2021. Flatiron is ahead of schedule with a projected winter 2021 final construction. The initiative is upgrading a 2-mi. section of Route 20 from the Yuba River Bridge to approximately 1/3-mi. east of Smartsville Road, as well as straightening curves on a section of the highway, widening segments of highway to create uniform 12-ft. wide lanes and shoulders to a standard 8-ft. width, constructing a new bridge on the realigned section of highway and increasing sight distances for motorists traveling on the highway. In essence, the current two-lane highway, in an isolated hilly area with forests on either side and power lines and electrical infrastructure on both sides, is being widened by one lane in each direction with shoulders and intermittent passing lanes. The primary challenges have been the topography and site geology. Large amounts of hard rock were encountered that required controlled blasting to be conducted. The design and construction needed to balance the roadway geometrics with environmental, land use and physical constraints. Roadways are designed with a 50-year life, structures are built for 100 plus year life. The construction is one of the first in the state to heavily utilize unmanned aerial systems [UAS] for the inspection and measurements of earthwork. The structure design is a standard cast-in-place box girder structure. This design minimizes construction costs and maintenance over the life of the structure. Approximately 280,000 cu yds. of rock and earth have been removed, with approximately one-third of that quantity requiring blasting. All of the material has been utilized on-site for the embankment construction. There has also been construction of an 800 ft. long and 60 ft. wide bridge, with one lane in each direction, with an additional passing lane in the East uphill direction. Bridge construction began in early May with 96-in. diameter cast-in driven holes (CIDH), some shafts being as deep as 90 ft. and others as shallow as 30 ft. Drainage upgrades are an important part of the work for the stretch of highway in which some components were last updated in 1939.
(Source: Construction Equipment Guide, 11/4/2020)

In June 2007, the CTC considered a request from Yuba City for a new roadway connection at Harter Parkway (~ SUT 14.474), due to projected growth and congestion in the vicinity of the Harter Parkway connection. Yuba City is proposing to convert this existing connection to Route 20 to a full four-way intersection to relieve local traffic congestion and support planned development and growth in the area. A commercial development of 35 acres will start construction in 2007 immediately south of this intersection. This section of Route 20 is a four-lane expressway with 8-foot outside shoulders. The highway has a paved median for about 500 feet west of Harter Parkway and an unpaved median for the rest of this corridor. Within the limits of Yuba City there are a number of intersections along Route 20. Numerous driveways have been constructed using encroachment permits. Harter Parkway is connected to Route 20 from the north. On the south side of the intersection, only a private drive connection has been maintained.

Route 70 near Yuba City to Route 49 near Grass Valley

In December 2011, Caltrans completed emergency repairs on the 10th Street Bridge over the Feather River (~ YUB 0.005). The seven-month, $12 million project strengthened two of the 23 piers that support the 64-year-old bridge and added new erosion protection for three other piers. The emergency work ensures the four-lane span linking the twin cities of Yuba City and Marysville will withstand heavy river flows in the future. During an inspection in March 2011, Caltrans bridge engineers discovered emergency scour conditions existed on the bridge. High water flows over the years caused 19 feet of erosion to one the pier footings. An adjacent pier also was deemed “at risk” in a high-water event. Emergency repairs were launched June 1, 2011. Construction crews drove 20 new steel piles as deep as 185 feet into the river bed to strengthen two footings and placed 8,000 cubic yards of 500- to 1,000-pound boulders (known as riprap) to protect three other piers from erosion. The project also used 2,200 cubic yards of concrete and 3,000 linear feet of 48-inch diameter steel pipe.

In August 2011, the CTC approved for future consideration of funding a project that will rehabilitate the route in the city of Marysville (~ YUB 0.944), including new pavement, curb ramps, and sidewalks. The CTC also approved $41,500,000 in SHOPP funding for repairs in Marysville, from First Street Undercrossing to east of Binney Junction; also on Route 20 from Feather River Bridge to 0.1 mile east of Levee Road, that will rehabilitate 17.0 lane miles of roadway to improve the ride quality, prevent further deterioration of the road surface, minimize the costly roadway repairs and extend the pavement service life.

In August 2016, the CTC approved for future consideration of funding a project on Route 20 (03-Yub-20, PM 8.0/10.2) in Yuba County that will rehabilitate the roadway and widen shoulders on a portion of Route 20 near the City of Marysville. The project is programmed in the 2016 State Highway Operation and Protection Program. The total programmed amount is $5,120,000 for capital and support. Construction is estimated to begin in Fiscal Year 2018-19. The scope, as described for the preferred alternative, is consistent with the project scope programmed by the Commission in the 2016 State Highway Operation and Protection Program.

In December 2017, the CTC amended the following project in the SHOPP: 03-YUB-20 R18.0/20.3: On Route 20 in Yuba County: Near Smartsville, from the Yuba River Bridge to east of Smartsville Road. Realign and widen roadway

In March 2016, the CTC approved for future consideration of funding a project in Yuba and Nevada Counties that will realign curves and improve shoulders on Route 20 near the community of Lake Wildwood (~ NEV R4.704). The project is programmed in the State Highway Operation and Protection Program. The total estimated cost is $25,370,000 for capital and support. Construction is estimated to begin in Fiscal Year 2017-18. The scope, as described for the preferred alternative, is consistent with the project scope programmed by the Commission in the 2014 State Highway Operation and Protection Program. A copy of the MND has been provided to Commission staff. The project will result in less than significant impacts to the environment after mitigation. The following resource areas may be impacted by the project: cultural resources, and biological resources. Avoidance and minimization measures will reduce any potential effects on the environment. These measures include, but are not limited to, data recovery protocol to be followed for any archeological resources found on the project site, replacement trees to be planted in the project right-of-way where feasible, disturbed riparian habitat to be mitigated through on-site restoration, and a wildlife undercrossing to be constructed for wildlife migration. As a result, an MND was completed for this project.

In June 2021, the CTC authorized relinquishment of right-of-way, consisting of two segments of collateral facilities in the county of Nevada along Route 20 on Deadman’s Flat Road and South Ponderosa Way (3-Nev-20-PM R9.9/R10.1), under the terms and conditions as stated in Resolution No. 21-020 dated January 26, 2021. The County, by letter dated April 21, 2021, agreed to waive the 90-day notice requirement and accept title upon relinquishment by the State.
(Source: June 2021 CTC Agenda, Agenda Item 2.3c)

Route 49 near Grass Valley/Nevada City to I-80 near Yuba Pass

Dorsey Drive (~ NEV R14.358)

In May 2008, the CTC considered approval for future consideration of funding roadway improvements on a portion of Route 20 near Grass Valley for which a Mitigated Negative Declaration (MND) has been completed. The project will involve the removal of mature oak trees and construction activities in the U.S. Army Corps of Engineers jurisdictional wetlands. The approximate boundaries are Idaho-Maryland Road and Brunswick Road. The project will include adding an interchange to Route 20 at Dorsey Drive. Specifically, the Nevada County Transportation Commission (NCTC) is proposing to replace the existing Dorsey Drive overcrossing with a full interchange to address operational problems at adjacent interchanges (Idaho-Maryland Road and Brunswick Road) as well as at the local surface streets of East Main Street and the Nevada City Highway. The primary purpose for this project is to reduce local traffic burden thereby creating additional capacity for future development. This new interchange will also provide more direct access to the specific high use sites of Sierra Nevada Memorial Hospital and the Sierra College Nevada County Campus. In the vicinity of the proposed Dorsey Drive interchange, Route 20 is a four-lane divided freeway. It was constructed in the late 1960's and is located in the western foothills of the Sierra Nevada Range and within the urbanized area of the City of Grass Valley. Route 20 is a major arterial for the City of Grass Valley and Nevada City. Dorsey Drive overcrossing is currently a two-lane collector, constructed in 1960. The proposed project will replace the overcrossing with a five-lane wide structure (including a turning lane) on a full compact diamond interchange. The interchange will be located approximately 0.64 mile east of the Idaho-Maryland Road interchange and approximately 0.53 mile west of Brunswick Road interchange. The project will also include the construction of auxiliary lanes between the proposed Dorsey Drive interchange and both adjacent interchanges to mitigate merging conflicts caused by nonstandard spacing. A Project Study Report for this project was approved on December 6, 1994. The Project Report was approved on June 30, 2006, and a Supplemental Project Report was approved on February 5, 2008. The compact diamond interchange alternative was selected and has been accepted by the NCTC and the City of Grass Valley. In order to construct this project, Commission approval is required for the new public road connection to Route 20 at Dorsey Drive. At the completion of the project, it is proposed that the local road be relinquished to the City of Grass Valley. The 2008 construction capital cost estimate is $18.8 million and right of way capital cost is estimated at $3.0 million. The project is programmed for $16.6 million in the 2008 State Transportation Improvement Program in Fiscal Year 2009-10. Additional local funding will come from regional Traffic Mitigation Fees and local sales tax funds.

In August 2012, the CTC approved $14,155,000 in SHOPP funding for the Dorsey Drive Interchange (Phase 1). This is to fund construction of the interchange. Phase 1 portion includes southbound ramp and all right of way.

Groundbreaking for the $15 million Dorsey Drive Interchange took place on April 29, 2013. The two-phase project widened Dorsey Drive to five lanes and improved 1.4 miles of SR 20/49. Aesthetic enhancements were added to concrete bridge walls, railings and street lighting. 1,272 linear feet of sound walls matching the project color scheme were installed as well.
(Source: AARoads Route 49 South. See page for specific references.)

Curve Improvements Near White Cloud Campground (03-Nev-20 29.7/30.9)

Curve Improvements near White Cloud In June 2017, the CTC added the following to the SHOPP: 03-Nev-20 29.7/30.9 On Route 20: Near Nevada City, from 0.1 mile east of White Cloud Campground to 0.9 mile west of Washington Road. Curve improvement, shoulder widening and improve clear recovery zone. $613K (R/W) $8,237K (C) $3,649K (Support) PA&ED: 02/01/2019 R/W: 05/01/2020 RTL: 05/01/2020 BC: 11/01/2020

In June 2019, the CTC approved the following SHOPP scope amendment: 03-Nev-20 29.7/30.9 PPNO 3994 ProjID 0315000116. Route 20 Near Nevada City, from 0.1 mile east of White Cloud Campground to 0.9 mile west of Washington Road. Curve improvement, shoulder widening and improve clear recovery zone. Due to the presence of archaeological sites and prehistoric cultural resources, additional environmental studies and coordination with United States Forest Service are required, resulting in a delay of the project.. Completion pushed back to FY20-21.
(Source: June 2019 CTC Minutes, Agenda Item 2.1a.(1) Scope Item 28)

In January 2020, it was reported that Caltrans was hosting an open house in February to seek community comments about a proposed safety improvement project on Route 20 in Nevada County. Caltrans proposes to improve highway safety by modifying the alignment of two non-contiguous segments of the highway and adding turnouts. The $55.3 million project calls for updating these roadway segments to current standards by increasing the curve radii, widening shoulders to eight feet, adding turnouts in both directions and improving the vertical profile grade. Additionally, the project will widen an existing turnout to standard width. Construction is estimated to start in fall 2021.
(Source: YubaNet.Com, 2/9/2020)

The 2020 SHOPP, approved in May 2020, included the following Collision Reduction item of interest (carried over from the 2018 SHOPP): 03-Nevada-20 PM 29.7/30.9 PPNO 3994 Proj ID 0315000116 EA 0H240. Route 20 near Nevada City, from 0.1 mile east of White Cloud Campground to 0.9 mile west of Washington Road. Curve improvement, shoulder widening and improve clear recovery zone. Programmed in FY21-22, with construction scheduled to start in October 2021. Total project cost is $12,499K, with $8,850K being capital (const and right of way) and $3,649K being support (engineering, environmental, etc.).
(Source: 2020 Approved SHOPP a/o May 2020)

In June 2020, the CTC approved for future consideration of funding the Omega Curves Project, which will improve two non-contiguous segments of Route 20 in Nevada County. (EA 03-2H62U) Specifically, the project proposes to improve two non-contiguous segments of the alignment by modifying the existing horizontal and vertical curves of the roadway and adding turnouts. The project will update the roadway to current standards by increasing the curve radii, widening shoulders to 8 feet, adding turnouts for both directions, and improving the vertical profile grade. It is comprised of three smaller SHOPP
projects, two of which are safety projects (EA 03-0H240, 03-2H620) intended to reduce collisions while the third project is an operational improvement project (EA 03-1H810) to widen the existing turnout. These projects are fully funded and are currently programmed in the 2018 SHOPP. Project EA 0H240 is programmed for $12,499,000 for capital and support. Project EA 2H620 is programmed for $39,480,000 for capital and support and Project EA 1H810 is programmed for $3,340,000 for capital and support. Construction is estimated to begin 2021-22. The scope, as described for the preferred alternative, is consistent with the project scopes programmed by the Commission in the 2018 SHOPP.
(Source: June 2020 CTC Agenda, Agenda Item 2.2c.(1))

In June 2020, the CTC approved the following support allocation for this project: 03-Nev-20 29.7/30.9. PPNO 3994 ProjID 0315000116 EA 0H240. Route 20 near Nevada City, from 0.1 mile east of White Cloud Campground to 0.9 mile west of Washington Road. Curve improvement, shoulder widening and improve clear recovery zone. Allocation: PS&E $976,000; R/W Sup $291,000.
(Source: June 2020 CTC Agenda, Agenda Item 2.5b.(2a) #7)

In June 2021, the CTC approved the following allocation: $10,200,000. 03-Nev-20 29.7/30.9. PPNO 03-3994; ProjID 0315000116; EA 0H240. Route 20: Near Nevada City, from 0.1 mile east of White Cloud Campground to 0.9 mile west of Washington Road. Outcome/Output: Improve safety by realigning curves, widening shoulders, adding turnouts, and improving clear recovery zone. This project will reduce number and severity of collisions. (Future consideration of funding approved under Resolution E-20-45; June 2020.) (EA 0H240/PPNO 03-3994 combined with EA 0H660/PPNO 03-3996, EA 1H810/PPNO 03-3999, and EA 2H620/PPNO 03-4000 for construction under EA 2H62U/Project ID 0319000021.) Allocation (including use of savings from preliminary phases): CON ENG $1,286,000 CONST $8,237,000.
(Source: June 2021 CTC Agenda, Agenda Item 2.5b.(1) #7)

In March 2022, it was reported that Granite has been selected for the Route 20 Omega Curve Realignment project in Nevada County, California. The $32 million contract was awarded by Caltrans and funded by State and Federal aid. This project realigns two existing curves along Route 20, a high-traffic area with many accidents, and will create a safer passage for the traveling public in Nevada County. It is a large earthwork project, running through steep terrain of the Tahoe National Forest.
(Source: Business Wire, 3/9/2022)

In September 2023, it was reported that Caltrans was planning a 12-day closure of Route 20 east of Nevada City for major roadwork on the Omega Curves Project. The first closure would take place in the Lowell Hill segment between the Omega Overlook and Bear Valley. Crews then will move the closure location west to the White Cloud segment between the White Cloud U.S. Forest Service and Campground and Washington Road. During the closure construction crews will perform grading and paving work to construct tie-in locations to divert the traveling public from the current roadway to the new alignment. The work is part of the $62.5 million Omega Curves project, which will improve safety and reduce collisions on Route 20 by realigning curves on two non-contiguous segments near White Cloud and Lowell Hill, widening shoulders, improving the highway’s sight distance, and adding designated left-turn lanes near Conservation Road and Washington Road. In addition, three turnouts will be added where slow-moving vehicles can allow motorists to safely pass, while also serving as traffic-enforcement locations for the CHP. In October 2023, it was reported that Caltrans announced that it has finished its project between the I-80 interchange and Grass Valley. The goal of the project was to improve safety and reduce collisions by realigning curves near White Cloud and Lowell Hill, which is east of Nevada City. The construction is part of a $65 million project labeled “Omega Curves.”
(Source: Yubanet, 9/11/2023; Fox 40 News, 10/7/2023)

Excelsior Point Road/Zeibright Road Curve Improvements (03-Nev-20 37.1/39.8)

In August 2017, the CTC added the following to the SHOPP: 03-Nev-20 37.1/39.8 Route 20: Near Emigrant Gap, from 0.3 mile west of Excelsior Point Road to 1.3 mile west of Zeibright Road. Curve improvement and widen shoulders. $1,380K (R/W) $27,480K (C) $10,620K (Support) PA&ED: 02/01/2019R/W: 04/15/2020RTL: 05/15/2020BC: 11/15/2020

In June 2019, the CTC approved the following SHOPP scope amendment: 03-Nev-20 37.1/39.8 PPNO 4000. ProjID 0317000165. Route 20 Near Emigrant Gap, from 0.3 mile west of Excelsior Point Road to 1.3 mile west of Zeibright Road. Curve improvement and widen shoulders. Due to the presence of archaeological sites and prehistoric cultural resources, additional environmental studies and coordination with United States Forest Service are required, resulting in delaying the project. Completion pushed back to FY20-21
(Source: June 2019 CTC Minutes, Agenda Item 2.1a.(1) Scope Item 29)

The 2020 SHOPP, approved in May 2020, included the following Collision Reduction item of interest (carried over from the 2018 SHOPP): 03-Nevada-20 PM 37.1/39.8 PPNO 4000 Proj ID 0317000165 EA 2H620. Route 20 near Emigrant Gap, from 0.3 mile west of Excelsior Point Road to 1.3 mile west of Zeibright Road. Curve improvement and widen shoulders. Programmed in FY21-22, with construction scheduled to start in October 2021. Total project cost is $39,480K, with $28,860K being capital (const and right of way) and $10,620K being support (engineering, environmental, etc.).
(Source: 2020 Approved SHOPP a/o May 2020)

In June 2020, the CTC approved the following support allocation for this project: 03-Nev-20 37.1/39.8. PPNO 4000 ProjID 0317000165 EA 2H620. Route 20 near Emigrant Gap, from 0.3 mile west of Excelsior Point Road to 1.3 mile west of Zeibright Road. Curve improvement and widen shoulders. Allocation: PS&E $2,810,000; R/W Sup $410,000. (Concurrent consideration of funding under Resolution E-20-45; June 2020.) (Sixteen month time extension for PS&E and R/W Sup approved under Waiver 19-29; June 2019.)
(Source: June 2020 CTC Agenda, Agenda Item 2.5b.(2a) #9)

In June 2021, the CTC approved the following allocation: $32,370,000. 03-Nev-20 37.1/39.8. PPNO 03-4000; ProjID 0317000165; EA 2H620. Route 20 Near Emigrant Gap, from 0.3 mile west of Excelsior Point Road to 1.2 miles west of Zeibright Road. Outcome/Output: Improve safety by realigning curves and widening shoulders, and construct two animal crossings. This project will reduce the number and severity of collisions. (Future consideration of funding approved under Resolution E-20-45; June 2020.) (EA 2H620/PPNO 03-4000 combined with EA 0H240/PPNO 03-3994, EA 1H810/PPNO 03-3999, and EA 0H660/PPNO 03-3996 for construction under EA 2H62U/Project ID 0319000021.) Allocation (including use of savings from preliminary phases):CON ENG $3,480,000 CONST $27,480,000.
(Source: June 2021 CTC Agenda, Agenda Item 2.5b.(1) #9)

Naming

The portion of this route from US 101 N of Ukiah to I-80 near Emigrant Gap (~MEN 33.374 to NEV 45.374) has historically been named the "Tahoe-Ukiah Highway".

The portion of this route from Route 53 to Route 16 (~ LAK 31.384 to COL 3.304) was named the "Yolo and Lake Highway" by Resolution Chapter 283 in 1915. It was named by location.

The portion of Route 20 in Colusa County (~ COL 0.000 to COL R39.303) is designated as part of the National Purple Heart Trail in order to honor the men and women who have been wounded or killed in combat while serving in the United States Armed Forces. Additionally, the County of Colusa Veterans Tribute Wall was erected and dedicated on Veterans Day 2014 to recognize the honorable service and sacrifices made by all veterans who have lived, or do now reside, in the County of Colusa; it is located at the junction of Route 20 and Route 45, and is accessible via all state highways within the County of Colusa. Designed by Assembly Concurrent Resolution (ACR) 191, Res. Chapter 163, Statutes of 2016, on September 1, 2016.

This route is Colusa Avenue in Yuba City (~ SUT R15.549 to SUT 17.05).

The portion of Route 20 from YUB 0.000 to YUB R3.389 and Route 70 from YUB 13.604 to YUB 15.850 in the City of Marysville in the County of Yuba is designated as part of the National Purple Heart Trail. The resolution designating these segments noted that the Marysville Veterans Memorial Center is located on the west side of Route 70 in the City of Marysville and is the home of the Marysville Veterans of Foreign Wars Post 948 and the Veterans Memorial Wall for Purple Heart Recipients, Veterans, and Honoring Pearl Harbor. It also noted that the historic Marysville Cemetery is located on the east side of Route 70 in the City of Marysville and is the final resting place of approximately 104 veterans, some of whom are Purple Heart recipients, from all wars fought by the United States beginning with the Mexican-American War. Lastly, it noted that the Marysville Veterans of Foreign Wars Post 948 wished to continue the National Purple Heart Trail through the City of Marysville on Route 20 and Route 70; and that Senior Vice Commander Brock Bowen of the Marysville Veterans of Foreign Wars Post 948 took the initiative to bring the National Purple Heart Trail through the City of Marysville. Designed by Assembly Resolution ACR 19, Res. Chapter 106, Statutes of 2021, on September 7, 2021

Eric W Rood The portion of Route 20 between the intersection of the Rough and Ready Highway and Penn Valley Drive and its junction with Route 49 (~ NEV R6.568 to NEV R12.16), in Nevada County is named the "Eric W. Rood Memorial Expressway". This segment was named in honor of Eric W. Rood, a California native who graduated from California State University at Sacramento, and furthered his education by receiving a master's degree in management from George Washington University. He also graduated from the Air War College and Harvard Business School. Rood enlisted in the United States Air Force in 1942. He earned his wings and commission in mid-1943 and went on to complete an honorable tour of military service. Thereafter, he taught at the Bombardier School at Mather Air Force Base near Sacramento before being deployed to the Philippines for three years. He retired from the Air Force as a colonel in 1973 at McClellan Air Force Base. While stationed with the Pentagon, he played a role in bringing a missile program to Beale Air Force Base. Rood served as Nevada County's 4th District Supervisor from 1975 to 1986, inclusive, including two terms as chair. As Supervisor, Rood was instrumental in securing state funding for the Route 20 bypass between Grass Valley and Penn Valley. Today, the highway is a busy thoroughfare that has been critical to growth andeconomic development in Penn Valley. Rood also worked with the state for more than two decades to resolve the many special problems faced by the rural communities of Nevada County. While serving as a county supervisor, Rood was president of the state's powerful Regional Council of Rural Counties, director of the County Supervisor's Association of California, vice chairman of the California Local Agency Formation Commission, and served on the board of the Sierra Economic Development District, the Sierra Planning Organization, and the Foothill Strategy Advisory Committee. He also served on the Nevada County local agency formation commission, the Golden Chain Council of the Mother Lode, the Foothill Airport Land Use Commission, Mountain County Air Basin, the Area 4 Agency on Aging, and the Foothill Strategy Advisory Committee. He was a founder of the Western Gateway Recreation and Park District that helped build Western Gateway Park in Penn Valley and he was also a member of various other organizations Eric W. Rood retired in January 1987 and passed away in 1998. Named by Assembly Concurrant Resolution (ACR) 122, 6/2/2010, Resolution Chapter 32.
(Image Source: History of Eric W Rood)

This route is named the "Golden Center Freeway" between Route 49 (near Grass Valley) (~ NEV R12.16) and Nevada City (~ NEV R17.224). It was named by Senate Resolution 340 and House Resolution 556 in 1968. It was named by location.

The Route 20/Route 49 NE-bound frontage road in Grass Valley from its intersection with South Auburn Street to its intersection with Bennett Street (~NEV R12.856 to NEV R13.12) is named "Hansen Way." This segment was named in honor of the Hansen family of Grass Valley, for their contributions to the community and for their building supply company, Hansen Brothers, that was established in 1953. The Hansen family historically has been very civic minded and has contributed community service and philanthropic gifts to the community. Named by Senate Concurrent Resolution (SCR) 10, Resolution Chapter 104, on 9/6/2005.
(Image source: Grass Valley Downtown Assn)

Chinatown Historical Plaque mentioning the Tinloy family The Route 20/Route 49 SW-bound frontage road in Grass Valley from the intersection with South Auburn Street to Bennett Street (~NEV R12.856 to NEV R13.12) is officially named "Tinloy Street." This segment was named in honor of the Tinloy family of Grass Valley. The Tinloy family has Chinese roots and its presence in Grass Valley dates back to the 19th century. John Tinloy was born to Kan Tinloy. Kan Tinloy, emigrated to Nevada County from Canton province in southern China during the Gold Rush. He eventually settled in Grass Valley’s Chinatown, where he opened the Quong Chong Co. general store store in the late 1880s. Kan Tinloy eventually returned to China, where he died. His son, John Tinloy (1876-1944), who was born in China and came to America after his father had sent for him, took over the Quong Chong store, which he ran until the 1920s. The Qunog Chong store offered Chinese traditional food and artifacts, and this store evolved into a social place, bank, and an employment bureau. In 1912, John Tinloy was “the most influential individual in local Chinatown,” according to an article published by the Nevada County Historical Society in 1972. He married (Alice) Chen Shee, and together they raised one daughter and three sons, and the family opened and operated a fine women's apparel store and a grocery store in Grass Valley. The Tinloy family was active in the Methodist Church in Grass Valley. The Tinloy family, stemming from the community activism of John Tinloy, has historically been very civic minded and contributed community service and philanthropic gifts to the community. Named by Senate Concurrent Resolution (SCR) 11, Resolution Chapter 121, on 9/14/2005.
(Image credit: Historical Marker Database)

Named Structures

Adam Strain / John A (JT) Lucente / Sean A Stokes The Brighton Street Overcrossing over Route 20 (Bridge 17-0095 NEV R011.83) in the City of Grass Valley is named the "Gold Star Memorial Bridge". It was named in memory of Lance Corporal Adam Strain, Lance Corporal John "JT" Lucente, and Corporal Sean A. Stokes. Lance Corporal Adam Strain, from the City of Smartville, who had wanted to be a Marine since he was old enough to play with toy soldiers, and knew at 15 years of age that he wanted to help his nation at war. Lance Corporal Strain played defensive end on the Nevada Union High School Miner's football team and graduated from that school in 2003. Lance Corporal Strain, who was assigned to 1st Battalion, 5th Marine Regiment, 1st I Marine Division, 1st Marine Expeditionary Force, Camp Pendleton, attached to 2nd Marine Division, 2nd II Marine Expeditionary Force (Forward), was killed in action in Iraq on August 3, 2005, at 20 years of age. Lance Corporal John "JT" Lucente, from the City of Lakeof the Pines, joined the United States Marine Corps during his junior year at Bear River High School, where he had written his senior project on the Marine Corps, and following his graduation from that school in 2004, began active duty. Lance Corporal Lucente had decided to join the Marine Corps out of a deep desire to serve God and country. Lance Corporal Lucente proudly wore his Marine uniform and felt proud that he completed the rigorous training required to become a Marine. Lance Corporal Lucente was an honorable man, who bore his commitment to the Marines with dignity and respect, and was very proud to serve his country. Lance Corporal Lucente, who was assigned to Battalion Landing Team 2nd Battalion, 1st Marine Regiment, 13th Marine Expeditionary Unit, I Marine Expeditionary Force, Camp Pendleton, attached to II Marine Division, 2nd Marine Expeditionary Force (Forward), was killed in action in Iraq on November 16, 2005, at 19 years of age. Corporal Sean A. Stokes, from the City of Lake of the Pines, graduated from Bear River High School in 2001. Corporal Stokes was courageous, dedicated, and passionate about serving as a Marine, cared deeply for his fellow Marines, and extended his enlistment to volunteer for a third tour of duty to serve with his platoon when it was redeployed to Iraq. Corporal Stokes, who was assigned to 3rd Battalion, 1st Marine Regiment, I Marine Division, 1st Marine Expeditionary Force, was killed in action in Iraq on July 30, 2007, at 24 years of age. Named by Senate Concurrent Resolution 78, Resolution Chapter 88, on August 24, 2012.
(Image sources: AARoads; LA Times (AJS); ArllingtonCemetary (JAL); LA Times (SAS))

Bridge 17-083, at the Mill Street Undercrossing in Grass Valley in Nevada county (NEV R012.16), is named the "Ernest J. Stidham, 1st Lieutenant, Memorial Bridge". It was built in 1969, and was named by Assembly Concurrent Resolution 43, Chapter 220, in 1971. First Lieutenant Ernest James Stidham, casualty of the Vietnam War. As a member of the Army Reserve, 1LT Stidham served our country until December 22nd, 1968 in Tay Ninh, South Vietnam. He was 25 years old and was not married. Ernest died from small arms fire. Ernest was born on March 14th, 1943 in Carmichael, California.
(Image source: Waymarking; HonorStates.org)

Lt Col Bruce Allen Jensen Bridge 17-049 at the Route 20/Route 49 separation and Empire Street (NEV R012.24), is named the "Bruce Allen Jensen, Lt. Col., USAF, Bridge". It was built in 1969, and was named by Assembly Concurrent Resolution 43, Chapter 220, in 1971. Lieutenant Colonel Bruce Allan Jensen was a casualty of the Vietnam War. As a member of the Air Force, LTC Jensen served our country until August 27th, 1967 in Laos. He was 38 years old and was married. Bruce died when his plane crashed into the land.
(Image source: Waymarking; Vietnam Veterans Memorial)

David E. Freestone / Harry Lee Theurkauf Bridge 17-050, at the Route 20/Route 174 separation in Nevada county (NEV R012.85), is named the "David E. Freestone and Harry Lee Theurkauf Memorial Bridge". It was built in 1970, and was named by Assembly Concurrent Resolution 43, Chapter 220, in 1971. Private First Class David Edward Freestone was a casualty of the Vietnam War. As a member of the Army, PFC Freestone served our country until August 27th, 1969 in Binh Duong, South Vietnam. He was 20 years old and was not married. David died from small arms fire. Specialist Five Harry Lee Theurkauf was also a casualty of the Vietnam War. As a member of the Army, SP5 Theurkauf served our country until June 5th, 1968 in Binh Duong, South Vietnam. He was 22 years old and was not married. Harry died from artillery fire.
(Image source: Waymarking; Virtual Wall Vietnam Veterans Memorial; HonorStates.org)

Kenneth W Scurr Bridge 17-051, the Bank Street undercrossing in Nevada county (NEV R013.04), is named the "Kenneth W. Scurr Memorial Bridge". It was built in 1969, and was named by Assembly Concurrent Resolution 43, Chapter 220, in 1971. Kenneth Wesley Scurr was a casualty of the Vietnam War. As a member of the Army Reserve, 1LT Scurr served our country until May 31st, 1969 in Pleiku, South Vietnam. He was 20 years old and was not married. Kenneth died from small arms fire. Kenneth was born on July 12th, 1948 in Grass Valley, California.
(Image source: The Union; VietnamVeterans Memorial Fund - Wall of Faces)

Bridge 17-052, the Bennet Street undercrossing in Nevada county (NEV R013.11), is named the "John Robert Kunkel Bridge". It was built in 1969, and was named by Assembly Concurrent Resolution 43, Chapter 220, in 1971. Lance Corporal John Robert Kunkel was a casualty of the Vietnam War. As a member of the Marine Corps, LCPL Kunkel served our country until January 3rd, 1969 in Quang Nam, South Vietnam. He was 21 years old and was not married. John died from small arms fire. John was born on April 16th, 1947 in Santa Clara, California.
(Image source: Waymarking; Vietnam Veterans Memorial Fund - Wall of Faces)

SSG Douglas A. Rix Bridge 17-079, the Idaho-Maryland Road undercrossing in Nevada county (NEV R013.61), is named the "Douglas A. Rix Memorial Bridge". It was built in 1969, and named by Assembly Concurrent Resolution 43, Chapter 220, in 1971. Staff Sergeant Douglas Alfred Rix was a casualty of the Vietnam War. As a member of the Army, SSG Rix served our country until February 28th, 1967 in Tay Ninh, South Vietnam. He was 24 years old and was married. Douglas died from multiple fragmentation wounds. Douglas was born on October 29th, 1942 in Grass Valley, California.
(Image source: Waymarking; HonorStates.org)

Bridge 17-081, the Dorsey Drive overcrossing in Nevada county (NEV R014.26), is named the "Thomas W. Cranford Memorial Bridge". It was built in 1969, and was named by Assembly Concurrent Resolution 43, Chapter 220, in 1971. Airman First Class Thomas W. Cranford was a casualty of the Vietnam War. As a member of the Air Force, PFC Cranford served our country until May 9, 1968 in Ho Chi Minh (Saigon), Hồ Chí Minh Municipality, Vietnam. He was 21 years old. Note: The original resolution mistakenly had the name as Crawford.
(Image source: Waymarking; Vietnam Veterans Memorial Foundation)

Bridge 17-048, at the Brunswick Road overcrossing in Nevada county (NEV R014.80), is named the "Gary Ames Miller Memorial Bridge". It was built in 1969, and was named by Assembly Concurrent Resolution 43, Chapter 220 in 1971. Lance Corporal Gary Ames Miller was a casualty of the Vietnam War. As a member of the Marine Corps, LCPL Miller served our country until June 1st, 1966 in Quang Tin, South Vietnam. He was 18 years old and was not married. Gary died from small arms fire.
(Image source: Wayfinding; Find a Grave)

James F Deeble Bridge 17-077, the Banner Ridge Road overcrossing in Nevada county (NEV R015.41), is named the "James F. Deeble Memorial Bridge". It was built in 1967, and was named by Assembly Concurrent Resolution 43, Chapter 220, in 1971. First Lieutenant James Frederick Deeble was a casualty of the Vietnam War. As a member of the Army Reserve, 1LT Deeble served our country until April 18th, 1970 in Bing Thuy, South Vietnam. He was 23 years old and was not married. James died from multiple fragmentation wounds. James was born on July 8th, 1946 in Nevada City, California.
(Image source: Artillery OCS Alumni)

Bridge 17-082, the Gold Flat Road undercrossing in Nevada county (NEV R015.92), is named the "John Stuart Seeley Memorial Bridge". It was built in 1967, and was named by Assembly Concurrent Resolution 43, Chapter 220, in 1971. Captain John Stuart Seeley was a casualty of the Vietnam War. As a member of the Army Reserve, CPT Seeley served our country until June 27th, 1966 in South Vietnam. He was 34 years old and was married. John died when his helicopter crashed into the land. John was born on April 10th, 1932 in Stockton, California.
(Image source: Wayfinding; HonorStates.org)

Michael D. Goeller Bridge 17-053, the Sacramento Street overcrossing in Nevada county (NEV R016.74), is named the "Michael Goeller Memorial Bridge". It was built in 1967, and was named by Assembly Concurrent Resolution 43, Chapter 220, in 1971. Specialist Four Michael Dennis Goeller was a casualty of the Vietnam War. As a member of the Army, SP4 Goeller served our country until June 1st, 1969 in Binh Duong, South Vietnam. He was 20 years old and was married. Michael died when his helicopter crashed into the land. Michael was born on June 7th, 1948 in Nevada City, California.
(Image source: Waymarking; VVMF Wall of Faces)

Bridge 17-055, the Broad Street overcrossing in Nevada county (NEV R016.99), is named the "Ronald J. Walber Bridge". It was built in 1967, and was named by Assembly Concurrent Resolution 43, Chapter 220, in 1971. Specialist Four Ronald James Walber was a casualty of the Vietnam War. As a member of the Army, SP4 Walber served our country until April 25th, 1968 in Binh Duong, South Vietnam. He was 19 years old and was not married. Ronald died from multiple fragmentation wounds. Ronald was born on June 3rd, 1948 in Nevada City, California.
(Image source: Waymarking; VVMF Wall of Faces)

Bridge 17-056, the Washington Street overcrossing in Nevada county (NEV R017.18), is named the "Philip A. Tritsch Memorial Bridge". It was built in 1967, and was named by Assembly Concurrent Resolution 43, Chapter 220, in 1971. Private First Class Philip Alon Tritsch was casualty of the Vietnam War. As a member of the Army Selective Service, PFC Tritsch served our country until January 28th, 1969 in Kontum, South Vietnam. He was 25 years old and was not married. Philip died from small arms fire. Philip was born on June 10th, 1943 in Nevada City, California.
(Image source: Waymarking; VVMF Wall of Faces)

This route also has the following Safety Roadside Rest Areas:

Alpha-Omega, in Nevada county, 4.1 mi. E of Washington Junction (NEV 35.695).

Historical Route

The portion of this route that is former US 99 is designated as part of "Historic US Highway 99" by Assembly Concurrent Resolution 19, Chapter 73, in 1993.

Business Routes

Rough & Ready, Grass Valley: Main Street, Rough and Ready Highway (this may be former business route)
Nevada City: Coyote Street, Sacramento Street, Broad Street (sparsly signed; cosigned with Route 49)
Williams: E Street

Scenic Route

[SHC 263.3] From Route 101 near Calpella to Route 16; and from Route 49 near Grass Valley to Route 80 near Emigrant Gap.

Classified Landcaped Freeway

The following segments are designated as Classified Landscaped Freeway:

County	Route	Starting PM	Ending PM
Nevada	20	R12.30	R13.68
Nevada	20	R16.19	17.30

Freeway

[SHC 253.2] Portion (2); form Ukiah to Emigrant Gap. It was constructed to freeway standards between Route 49 in Grass Valley and Route 49 in Nevada City. Added to the Freeway and Expressway system in 1959, Chapter 1062.

California Highways:
www.cahighways.org

State Route 20

Routing

Post 1964 Signage History

Pre 1964 Signage History

Status

Scenic Route

Post 1964 Signage History

Pre 1964 Signage History

Status

Naming

Named Structures

Historical Route

Business Routes

Scenic Route

Classified Landcaped Freeway

Freeway

Exit Information

Blue Star Memorial Highway

Statistics

Interregional Route

Other WWW Links

Pre-1964 Legislative Route

California Highways: www.cahighways.org

State Route 20

Routing

Post 1964 Signage History

Pre 1964 Signage History

Status

Scenic Route

Post 1964 Signage History

Pre 1964 Signage History

Status

Naming

Named Structures

Historical Route

Business Routes

Scenic Route

Classified Landcaped Freeway

Freeway

Exit Information

Blue Star Memorial Highway

Statistics

Interregional Route

Other WWW Links

Pre-1964 Legislative Route

California Highways:
www.cahighways.org