Map of Marin County in western California with SR 131 highlighted in red
|Defined by Streets and Highways Code § 431|
|Maintained by Caltrans|
|Length||4.317 mi (6.948 km)|
|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.
SR 131 is part of the National Highway System,a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.
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 (for a full list of prefixes, see the list of postmile definitions). Segments that remain unconstructed or have been relinquished to local control may be omitted. The entire route is in Marin County.
|Strawberry||0.00||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|
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