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From Route 101 at Hopland to Route 29 near Lakeport.
This segment (19 mi) was LRN 16, defined in 1909, and appears not to have been signed before 1964.
In July 2009, the CTC approved relinquishment of right of way in the county of Mendocino along Route 175 in Old Hopland at East Side Road (~ MEN 1.136), consisting of a reconstructed and relocated county road.
In March 2011, the CTC approved funding a number of projects on this route. Near Hopland from the Junction of Route 101 to 0.6 mile east of Mendocino/Lake County Line (~ MEN 0.064 to LAK 0.600), Route 175 will have 21.0 lane miles of roadway rehabilitated by overlaying with asphalt concrete to improve the ride quality, prevent further deterioration of the traveling surface, minimize costly roadway repairs, and extend the pavement service life. In Lake County, near Lakeport, from 4.9 miles east of Mendocino/Lake County Line to Route 175/Route 29 Junction; also near Kelseyville from Route 175/Route 29 Junction to Route 175/Route 29 Junction in Middletown there will be a project to rehabilitate 46.2 lane miles of roadway by overlaying with asphalt concrete to improve the ride quality, prevent further deterioration of the traveling surface, minimize costly roadway repairs, and extend the pavement service life.
Curve Realignment near McDowell Creek/Oasis (01-Lak-175 0.2/0.4)
In October 2018, the CTC amended the following into the
2018 SHOPP: 01-Lak-175 0.2/0.4. PPNO 3118. Project 0117000226. EA 0H460.
Route 175 Near Hopland, from 0.2 mile east to 0.4 mile east of Mendocino
County line. Curve realignment and shoulder widening. Est. cost:
$5,770,000. Est. const. begin: 12/22/2021. The CTC also approved the
following allocation: $510,000. 01-Lak-175 0.2/0.4. Route 175 Near
Hopland, from 0.2 mile east to 0.4 mile east of Mendocino County line.
Curve realignment and shoulder widening. PPNO 3118. Project 0117000226. EA
(Source: October 2018 CTC Agenda Item 2.1a.(1) Item 15; Agenda Item 2,.,5b.(2a) Item 1)
In January 2020, the CTC approved the following
pre-construction allocation: 01-Lak-175 0.2/0.4. PPNO 3118. ProjID
0117000226. EA 0H460. Route 175 near Hopland, from 0.2 mile east to 0.4
mile east of Mendocino County line. Curve realignment and shoulder
widening. Allocation: PS&E $1,256,000; R/W Sup $143,000
(Source: January 2020 CTC Agenda, Agenda Item 2.5b.(2a) #2)
The 2020 SHOPP, approved in May 2020, included the
following Collision Reduction item of interest (carried over from the 2018
SHOPP): 01-Lake-175 PM 0.2/0.4 PPNO 3118 Proj ID 0117000226 EA 0H460.
Route 175 near Hopland, from 0.2 mile east to 0.4 mile east of Mendocino
County line. Curve realignment and shoulder widening. Programmed in
FY21-22, with construction scheduled to start in December 2021. Total
project cost is $5,770K, with $2,886K being capital (const and right of
way) and $2,884K being support (engineering, environmental, etc.),
(Source: 2020 Approved SHOPP a/o May 2020)
From Route 29 near Kelseyville to Route 29 at Middletown.
Note: Between Lakeport and Kelseyville, the route is multiplexed with Route 29.
This segment was originally signed as part of the original 1934 definition of Route 29. It was LRN 89, defined in 1933. Route 29 presently takes a direct route over LRN 243, defined in 1959 between Lower Lake and Kelseyville.
In March 2017, the CTC amended the SHOPP to include $2,450,000 in funding on Route 175 near Middletown, from 0.2 mile east of Grouse Springs Road to 0.1 mile east of Socrates Mine Road (1-Lak-175 17.4/23.6, between Adams and Hoberg). Remove slide debris, repair drainage systems, reconstruct roadway, and conduct further geotechnical investigations of slope and roadway settlement. This was the result of damage from the Winter 2017 storms.
Kelsey Creek Bridge No. 14-0044 (LAK 19.48)
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); . Widen
bridge and upgrade bridge rails at Robinson 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)
Lake 175-Middletown Shoulders
In August 2017, the CTC approved for future consideration of funding 01-Lak-175, PM R25/27.5 Lak 175-Middletown Shoulders: a safety improvement project in Lake County that will widen roadway shoulders on Route 175 near the town of Middletown. The project will be funded from State Highway Operation and Protection Program (SHOPP) funds and is programmed in the 2016 SHOPP for an estimated $21.1 million Construction (capital and support) and Right of Way (capital and support). Construction is tentatively scheduled 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 SHOPP. 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: aesthetics, agriculture, biological resources, public services, recreation, and cultural resources. Avoidance and minimization measures will reduce any potential effects on the environment. These measures include, but are not limited to, access to agricultural parcels shall be maintained during construct, all disturbed areas shall be revegetated and restored, assumed cultural sites will be protected by the implementation of an Environmentally Sensitive Area Action Plan, and pre-construction roosting bat surveys shall be performed by a qualified biologist. As a result, an MND was completed for this project.
In August 2018, the CTC approved $14,044,000 in
SHOPP Safety Resolution G-03-10 Delegated Allocations for Lake 01-Lak-175
R25.0/27.5: Route 175 Near Middletown, from 0.1 mile east of Putah Creek
Bridge to Dry Creek Bridge. Outcome/Output: Improve safety by widening
shoulders, installing rumble strips, improving roadside clear recovery
zone, and extending existing culverts. This project will reduce the number
and severity of collisions.
(Source: August 2018 CTC Agenda Item 2.5f.(3) Item 2)
Signed Route 175 was not defined as part of the initial state signage of routes in 1934. It is unclear what (if any) route was signed as Route 175 between 1934 and 1964.
Overall statistics for Route 175:
In 1933, Chapter 767 defined the route "[LRN 60] near Hermosa Beach to [LRN 43] in Santa Ana Canyon via Artesia Ave" as part of the state highway system. In 1935, this route was added to the highway code as LRN 175 with that definition.
This route ran from Route 1 near Hermosa Beach to Route 18/US 91 in Santa Ana Canyon, generally along Artesia and Orangethorpe, turning at Imperial Highway. It later became the Riverside Freeway. This is former Route 14, also known as US 91; it is present-day Route 91.
Acronyms and Explanations:
Route 174 Route 176
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