State Route 131 is a state highway

State highway

State highway, state road or state route can refer to one of three related concepts, two of them related to a state or provincial government in a country that is divided into states or provinces :#A...

 in the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

 in Marin County

Marin County, California

Marin County is a county located in the North San Francisco Bay Area of the U.S. state of California, across the Golden Gate Bridge from San Francisco. As of 2010, the population was 252,409. The county seat is San Rafael and the largest employer is the county government. Marin County is well...

. It is a short route that connects U.S. Route 101 with the town of Tiburon

Tiburon, California

Tiburon is an incorporated town in Marin County, California. It occupies most of the Tiburon Peninsula, which reaches south into the San Francisco Bay. The smaller city of Belvedere occupies the south-east part of the peninsula and is contiguous with Tiburon...

. It is named Tiburon Boulevard along its entire length.

Route description

The route follows the northern and eastern shorelines of Richardson Bay

Richardson Bay

Richardson Bay is a shallow, ecologically rich arm of San Francisco Bay, managed under a Joint Powers Agency of four Northern California cities. The Richardson Bay Sanctuary was acquired in the early 1960s by the National Audubon Society. The bay was named for William A...

, an inlet of San Francisco Bay

San Francisco Bay

San Francisco Bay is a shallow, productive estuary through which water draining from approximately forty percent of California, flowing in the Sacramento and San Joaquin rivers from the Sierra Nevada mountains, enters the Pacific Ocean...

 north of Sausalito

Sausalito, California

Sausalito is a San Francisco Bay Area city, in Marin County, California, United States. Sausalito is south-southeast of San Rafael, at an elevation of 13 feet . The population was 7,061 as of the 2010 census. The community is situated near the northern end of the Golden Gate Bridge, and prior to...

. Approximately the first half of the route is four-lane divided road, until it reaches the site of the old railroad trestle and Blackie's Pasture, after which it narrows to two lanes on Tiburon Peninsula heading into Tiburon.

Beyond its western terminus at U.S. 101, Tiburon Boulevard becomes East Blithedale Avenue, which leads into Mill Valley. Its eastern terminus is at the intersection with Main Street in Tiburon, after which the road becomes Paradise Drive, a winding route which loops around the eastern side of Tiburon Peninsula, eventually leading to Corte Madera

Corte Madera, California

Corte Madera is an incorporated town in Marin County, California, United States. Corte Madera is located south of San Rafael, at an elevation of 39 feet . The population was 9,253 at the 2010 census...

.

Route 131 is part of the state highway system maintained by Caltrans because it was part of a larger plan in the 1950s to construct another bridge to San Francisco via Angel Island to complement the Golden Gate Bridge

Golden Gate Bridge

The Golden Gate Bridge is a suspension bridge spanning the Golden Gate, the opening of the San Francisco Bay into the Pacific Ocean. As part of both U.S. Route 101 and California State Route 1, the structure links the city of San Francisco, on the northern tip of the San Francisco Peninsula, to...

.

Major intersections

Note: Except where prefixed with a letter, postmiles were measured in 1964, based on the alignment as it existed at that time, and do not necessarily reflect current mileage.

The entire route is in Marin County

Marin County, California

Marin County is a county located in the North San Francisco Bay Area of the U.S. state of California, across the Golden Gate Bridge from San Francisco. As of 2010, the population was 252,409. The county seat is San Rafael and the largest employer is the county government. Marin County is well...

.
{| class=wikitable
!Location
!Postmile

!Destinations
!Notes
|-
|rowspan=2|Strawberry
|0.00
|East Blithedale Avenue
|Continuation beyond US 101
|-
|0.00
|
|Interchange
|-
|rowspan=3|Tiburon

Tiburon, California

Tiburon is an incorporated town in Marin County, California. It occupies most of the Tiburon Peninsula, which reaches south into the San Francisco Bay. The smaller city of Belvedere occupies the south-east part of the peninsula and is contiguous with Tiburon...

|1.86
|Trestle Glen Boulevard – Paradise Beach Park, Romberg Tiburon Center, SFSU

San Francisco State University

San Francisco State University is a public university located in San Francisco, California. As part of the 23-campus California State University system, the university offers over 100 areas of study from nine academic colleges...

|
|-
|4.39
|Main Street
|
|-
|4.39
|Paradise Drive
|Continuation beyond Main Street