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State Route 131

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


Routing Routing

Rte 131From Route 101 to Tiburon.

Post 1964 Signage History Post 1964 Signage History

This definition remains unchanged from 1963. This is via Tiburon Blvd.

It appears that one rationale for this route may have been to support an additional bay crossing. Marin County representatives had been working for a second crossing to San Francisco since the 1940s, and elected assemblycritters from the area supported the cause in 1950. In 1955, the legislature appropriated $50,000 for a formal engineering study of a bridge via Angel Island; and in 1956, the design and location of a span crossing Angel Island and landing on the Tiburon peninsula won federal approval. However, most Tiburon homeowners, including influential Marin Conservation League president and wealthy philanthropist Caroline Livermore, supported a plan to make Angel Island a state park. Arguing that a bridge landing would ruin the island’s potential for recreational use, they convinced state Department of Parks and Recreation officials to oppose it. Citizens from both sides of the bay staged protests, organized committees, and formed action groups, succeeding in delaying state construction plans. It is likely that the crossing fed into future planning for Route 131, it it was the likely N terminus of such a crossing.
(Source: "REVOLT AGAINST SPRAWL: Transportation and the Origins of the Marin County Growth-Control Regime" (paywall), Louise Nelson Dyble, University of Southern California, Journal of Urban History, Vol. 34 No. 1, November 2007, via Anneliese Agren, 11/15/2023)

Pre 1964 Signage History Pre 1964 Signage History

This route was LRN 52, defined in 1919. It was not a signed route before 1964.

Sign Route 131 was not defined as part of the initial state signage of routes in 1934. It is unclear what (if any) route was signed as Sign Route 131 between 1934 and 1964.

Status Status

In October 2023, it was reported that plans are in the works to repair and upgrade about 4.6 miles of Tiburon Boulevard. The project, estimated to cost around $23 million, would take about a year and be completed in three segments — the western, central and eastern parts — beginning in spring of 2026. The plan calls for upgrading or replacing guardrails, road signs, and drainage and electrical systems. It also includes upgrading curbside ramps to be compliant with the Americans with Disabilities Act, repaving roads and the addition of bike lanes. The western segment of the project, spanning from Tower Drive in Mill Valley to Reed Ranch Road in Tiburon, includes changes to two intersections. At East Strawberry Drive, the right turn lane onto eastbound Tiburon Boulevard would be removed and the existing bus stop on Tiburon Boulevard would be relocated. The new bus stop would be coordinated with transit authorities during the final design phase in the summer of 2025. Class IV bikeways would be added along Tiburon Boulevard, from approximately 1,000 feet west of the freeway to Trestle Glen Boulevard. A class I bikeway at East Strawberry Drive to Greenwood Cove Drive is also planned. The central section of the project, spanning from Reed Ranch Road to San Rafael Avenue, includes adding a class IV bike lane from Reed Ranch Road to Trestle Glen Boulevard. The Avenida Miraflores/Tiburon Boulevard intersection would be altered to remove the right turn lane from westbound Tiburon Boulevard onto northbound Avenida Miraflores. The eastern section, from San Rafael Avenue to the Tiburon Boulevard/Main Street intersection, includes a curb extension at the Mar West Street intersection. It also would add yield lines to the Ned’s Way/Tiburon Boulevard intersection. After the public comment period ends, Caltrans will either grant environmental approval, conduct additional environmental studies or abandon the project. The project also requires approval from agencies such as the state Department of Fish and Wildlife and the California Transportation Commission.
(Source: Marin I-J, 10/31/2023)

Other WWW Links Other WWW Links

Statistics Statistics

Overall statistics for Route 131:

Pre-1964 Legislative Route Pre-1964 Legislative Route

In 1933, Chapter 767 defined the route “[LRN 4] near Kingsburg to [LRN 10] near Lemoncove” as a state highway. It was codified in 1935 in the highway code as LRN 131 with the definition:

"[LRN 4] near Kingsburg to [LRN 10] near Lemon Cove"

This is present-day Route 201 between Kingsburg and Elderwood, and Route 216 between Woodlake and Lemon Cove. The Route 245 portion between Elderwood and Woodlake was LRN 129; the LRN 130 routing in the area is unclear.


Acronyms and Explanations:


Back Arrow Route 130 Forward Arrow Route 132

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