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State Route 128

Click here for a key to the symbols used. An explanation of acronyms may be found at the bottom of the page.


Routing Routing

  1. Rte 128 Seg 1From Route 1 near the mouth of the Navarro River to Route 101 near Cloverdale.

    Post 1964 Signage History Post 1964 Signage History

    As defined in 1963, this segment was "(a) The mouth of the Navarro River to Route 101 near Cloverdale via McDonald." Later in 1963, Chapter 1698 removed "via McDonald"

    In 1994, Chapter 1220 relaxed the origin: "(a) Route 1 near the mouth of the Navarro River to Route 101 near Cloverdale."

    Pre 1964 Signage History Pre 1964 Signage History

    This segment was LRN 48, defined in 1919. It was originally signed as signed Route 28, and in 1952 was renumbered as signed Route 128 (permitting the route around Lake Tahoe to be numbered as Route 28 in coordination with Nevada 28. Between McDonald and US 101, this was originally part of LRN 1, but became part of LRN 48 in 1935 when LRN 1 was moved. Route 128 was not an original state signed route (although Route 28 was).

    Status Status

    In October 2018, it was reported that SB1 funding includes a project to revamp a bridge the Anderson Creek Bridge on Route 128 (MEN 028.29, Bridge 10-0132) in the town of Boonville in Mendocino County.
    (Source: Redheaded Blackbird, 10/2/2018)

    In June 2011, the CTC approved $9.9 million to repave about 24 miles of Route 128 from near Boonville (~ MEN 28.755) south to the Sonoma County line (~ MEN MEN 50.886/SON 0.0).

    In December 2011, the CTC approved for future consideration of funding a project in Mendocino County that will repair a segment of roadway and the adjacent slope on Route 128, from Shearing Creek (~ MEN 34.527) to 0.7 mile west of Maple Creek Bridge (~ MEN 35.45), near Boonville. The project is programmed in the 2010 State Highway Operation and Protection Program (SHOPP). The total estimated project cost is $16,318,000 for capital and support. Construction is estimated to begin in Fiscal Year 2012-13. The scope, as described for the preferred alternative, is consistent with the project scope programmed by the Commission in the 2010 SHOPP. A copy of the MND has been provided to Commission staff. The project will mitigate potential impacts to riparian and waters of the U.S to a less than significant level. Potential impacts to wetlands in the project area will be mitigated by replacing impacted wetlands at a 1:1 ratio. Environmentally Sensitive Area (ESA) fencing will also be used in appropriate areas. Water quality impacts will be mitigated through implementation of Best Management Practices (BMP).

    Freeway Freeway

    [SHC 253.6] Entire portion. Added to the Freeway and Expressway system in 1959.


  2. Rte 128 Seg 2From Route 101 to Route 29 in Calistoga.

    Post 1964 Signage History Post 1964 Signage History

    In 1963, this segment was defined as "(b) Route 101 near Geyserville to Route 29 near Calistoga."

    In 1965, Chapter 1371 changed the origin to be "(b) Route 101 near Geyserville..."

    In 1990, Chapter 1187 clarified the terminus: "...to Route 29 near in Calistoga."

    Pre 1964 Signage History Pre 1964 Signage History

    This segment was LRN 103, defined in 1933. It was originally signed as signed Route 28, and in 1952 was renumbered as signed Route 128 (permitting the route around Lake Tahoe to be numbered as Route 28 in coordination with Nevada 28. Portions of this may have been cosigned with US 101. Route 128 was not an original state signed route (although Route 28 was).

    Status Status

    Robert Cruickshank noted that, on the road leading to the River Rock Casino (~ SON 8.221) (off of Route 128 in this area, known as the Alexander Valley) is a shield marking the road as Indian Rte 93.

    In November 2011, it was reported that Caltrans announced completion of two new bridges on Route 128 between Healdsburg and Calistoga. The Maacama Creek (~ SON 017.25) and Redwood Creek (~ SON 021.78) bridges, which had been under construction since summer 2010, are wider than the bridges they replaced. Total cost for both new bridges was $7 million.

    Freeway Freeway

    [SHC 253.6] Entire portion. Added to the Freeway and Expressway system in 1959.


  3. Rte 128 Seg 3From Route 29 near Rutherford to Route 113 near Davis via Sage Canyon.

    Post 1964 Signage History Post 1964 Signage History

    Unconstructed Unconstructed from Route 113 to Route 505. This segment is unchanged from 1963. Note: The 2002 Traversable Highways Report indicates this segment will be considered for assumption of maintenance after a two-mile section of Russell Blvd just east of Route 505 is reconstructed. Yolo County will improve the roadway as funds permit. It is unclear if this ever happened.

    Pre 1964 Signage History Pre 1964 Signage History

    This was LRN 102 between Rutherford and the junction with Route 37 (present-day Route 121; Steele Canyon Road, defined in 1933). It was LRN 6 (1933 extension) between Steele Canyon Road and I-505, and LRN 6 (1959 extension) from I-505 to Route 113 (former Alternate US 40). It was originally signed as signed Route 28, and in 1952 was renumbered as signed Route 128 (permitting the route around Lake Tahoe to be numbered as Route 28 in coordination with Nevada 28. It may also have been signed as part of Alternate US 40. Route 128 was not an original state signed route (although Route 28 was).

    Status Status

    The 2018 STIP, approved at the CTC March 2018 meeting, appears to adjust the funding for PPNO 2130M, Rt 128/Petrified Forest Rd Intersection Improv., from $425K to $475K, and delay construction to FY19-20. This project is in Calistoga at PM NAP 3.5/3.7. Install traffic signal and various ADA compliant pedestrian improvements at the Route 128/Petrified Forest Road Intersection.

    In March 2019, it was reported that Napa County was planning to start construction in Spring 2018 on the Conn Creek bridge (NAP R007.41, Bridge 21-0021, constructed in 1973) replacement on busy Silverado Trail. The Metropolitan Transportation Commission’s Vital Signs report says 13.9 percent of the bridge-and-overpass deck area in Napa County is “structurally deficient.” That is the worst rate among nine Bay Area counties and above the region’s 6.7 percent. In the case of the Conn Creek bridge along Silverado Trail east of Rutherford, the remedy goes far beyond a patch job. The existing bridge has been affected by scouring of the creek bed, causing settlement and damage to its structure, and it is not possible to repair the damaged components. Caltrans plans to removed the early 1970s bridge and build a new one at a cost of $8.3 million. Construction is to begin in spring 2019 and last into 2020. Caltrans plans to demolish and reconstruct the bridge in two sections, so one side is available to carry traffic while work goes on. One lane will be open in each direction during most of the construction period, except during temporary closures, Mara said. There will be no shoulders.
    (Source: Napa Valley Register, 3/11/2019)

    Hopper Slough Bridge (04-Napa-128 PM 5.1)

    The following project was included in the final adopted 2018 SHOPP in March 2018: PPNO 1451C. 04-Napa-128 5.1. Route 128 Near Rutherford, at Hopper Slough Bridge No. 20-0019. Replace bridge. Begin Con: 12/1/2022. Total Project Cost: $15,660K.

    The 2020 SHOPP, approved in May 2020, included the following Bridge Restoration item of interest (carried over from the 2018 SHOPP): 04-Napa-128 PM 5.1 PPNO 1451C Proj ID 0416000038 EA 4J830. Route 128 near Rutherford, at Hopper Slough Bridge No. 21-0019. Replace bridge. Programmed in FY21-22, with construction scheduled to start in January 2023. Total project cost is $15,660K, with $9,378K being capital (const and right of way) and $6,282K being support (engineering, environmental, etc.).
    (Source: 2020 Approved SHOPP a/o May 2020)

    Capell Creek Bridge (04-Nap-128, PM 19.7/20.7)

    Rte 128 Capell Creek BridgeIn August 2016, the CTC approved for future consideration of funding a project on Route 128 (04-Nap-128, PM 19.7/20.7) in Napa County that will replace the existing Capell Creek Bridge on Route 128 near the community of Rutherford. The project is programmed in the 2016 State Highway Operation and Protection Program. The total programmed amount is $18,225,000 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 2018, the CTC approved an allocation request for $20,116,000 for the State Highway Operation Protection Program (SHOPP) Bridge Preservation project (PPNO 0830B) on Route 128 in Napa County. This is an increase of 22% over the Capitol allocated amount, and 80% over the Support allocated amount. This is a Bridge Rehabilitation project to replace the existing structurally deficient Capell Creek Bridge and install horizontal drains on Route 128, in unincorporated Napa County, approximately 10 miles from the community of Rutherford. Route 128 is a north-south, two-lane, undivided conventional highway. The bridge is located on an active landslide; earth movement in the adjacent hillside undermines the Capell Creek Bridge’s abutment and foundation. Past installation of horizontal drains and polystyrene cushions at the project site did not resolve the slide, nor prevent further damage to the bridge, and the bridge is now beyond repair.

    The proposed replacement bridge is approximately 44 feet wide and 242 feet long, with 3 spans on the existing alignment. The bridge will be widened to provide for standard lane and shoulder widths. Minor roadway widening will occur both to the north and south of the new bridge to taper the proposed bridge roadbed to the existing roadbed and provide for access to the temporary detour bridge. The existing reinforced concrete/steel girder bridge will be demolished to construct a new precast/prestressed I-girder bridge with cast-in-place/reinforced concrete bents on the existing alignment. To minimize traffic impacts, the new bridge will require construction of a temporary detour bridge immediately east of the existing bridge. In addition to the bridge replacement, 13 new horizontal drains will be installed along Capell Creek to stabilize the hillside.

    The project was programmed in the 2016 SHOPP for a Construction allocation in Fiscal Year 2017-18; which is from July 1, 2017 to June 30, 2018. If the Department does not obtain an allocation during this programmed fiscal year, a time extension for the Construction Allocation is required to keep the project programming active. On June 28, 2018, the Commission approved an 18-month time extension for this project that will expire in December 2019. The Construction Capital cost increase is due to required design changes to the bridge foundations, construction staging changes, increased duration of project working days, and unexpected environmental permit requirements that resulted in a need to split the mitigation and monitoring scope into a separate follow-up project. The estimated Construction Support cost increase is due to additional working days to accommodate construction staging and to address environmental permit requirements.
    (Source: December 2018 CTC Minutes, Agenda Item 2.5d(1))

    Freeway Freeway

    [SHC 253.6] From Route 121 to Route 113 near Davis. Added to the Freeway and Expressway system in 1959.


Scenic Route Scenic Route

In April 2019, it was reported that legislation that would make Route 128 a “Scenic Highway” is nearer passage following action by the California Assembly. AB 998, sponsored by Assemblywoman Cecilia Aguiar-Curry, passed the Assembly floor with a bipartisan vote of 75-0. This bill makes Route 128 eligible to be named as a “Scenic Highway,” which will increase local economic activity in the North Bay region and bring new appreciation to the beauty of the route. Route 128 is roughly 140 miles long and runs through Yolo, Napa, Sonoma, and Mendocino counties. The highway is nestled against coastal mountains and passes through world class wineries, Michelin Star restaurants, rustic spas and resorts, historic sites, state and national parks, and scenic landscapes. Note that this bill will just add it to the Scenic Highway System. There are additional policies within Caltrans that must be satisfied before signs go up.
(Source: �� Mercury News, 4/24/2019)

Route 128 was added to the legislative scenic highway system by AB 998, Chapter 104, Statutes of 2019, 7/12/2019.

Interregional Route Interregional Route

[SHC 164.16] Entire route.

Other WWW Links Other WWW Links

Statistics Statistics

Overall statistics for Route 128:

Pre-1964 Legislative Route Pre-1964 Legislative Route

In 1933, Chapter 767 added the route "[LRN 31] to Death Valley and connection to the California-Nevada State Line" to the highway system. In 1935, the portion from [LRN 31] to Death Valley was added as LRN 127. LRN 128 was added to the highway code with the following routing:

[LRN 127] to the Nevada State Line

This routing remained unchanged until the 1963 renumbering. It ran from the Route 190/Route 127 junction to the Nevada state line, and is part of present day Route 127.


Acronyms and Explanations:


Back Arrow Route 127 Forward Arrow Route 129

© 1996-2020 Daniel P. Faigin.
Maintained by: Daniel P. Faigin <webmaster@cahighways.org>.