|Defined by Streets and Highways Code § 431|
|Maintained by Caltrans|
|Length||4.317 mi (6.948 km)|
|West end||US 101 in Strawberry|
|East end||Main Street in Tiburon|
State Route 131 (SR 131), named Tiburon Boulevard along its entire length, is a state highway in the U.S. state of California in Marin County. It is a short route that connects U.S. Route 101 with the town of Tiburon.
The route follows the northern and eastern shorelines of Richardson Bay, an inlet of San Francisco Bay north of Sausalito. 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.
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.
Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers an overlap due to a correction or change, and T indicates postmiles classified as temporary ( ). Segments that remain unconstructed or have been relinquished to local control may be omitted. The entire route is in Marin County.
|Strawberry||0.00||US 101 (Redwood Highway) – Eureka, San Francisco||Interchange; west end of SR 131; US 101 exit 447; road continues as East Blithedale Avenue to Mill Valley|
|Tiburon||1.86||Trestle Glen Boulevard – Paradise Beach Park, Romberg Tiburon Center, SFSU|
|4.39||Main Street||East end of SR 131; road continues as Paradise Drive|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
- California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original (XLS file) on June 30, 2015. Retrieved June 30, 2015.
- Federal Highway Administration (March 25, 2015). National Highway System: San Francisco, CA (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved September 29, 2017.
- Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012.
- Prado, Mark (2009-07-04). "Tiburon Boulevard work to start Monday". Marin Independent Journal. Archived from the original on 2012-04-04. Retrieved 2010-06-21.
- "Freeways Never Built, or Unbuilt after 1989 quake". FoundSF. Retrieved 2010-06-21.
- California Department of Transportation (July 2007). "Log of Bridges on State Highways". Sacramento: California Department of Transportation.
- California Department of Transportation, All Traffic Volumes on CSHS Archived 2011-07-21 at the Wayback Machine, 2006
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