California State Route 131
Route description
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.
History
Caltrans took over maintenance of Tiburon Boulevard and designated it as SR 131 in the 1950s; it was originally planned to be extended over a new bridge to San Francisco via Angel Island that would complement the Golden Gate Bridge.
Major intersections
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 to 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.
| Location | Postmile | Destinations | Notes | ||
|---|---|---|---|---|---|
| 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 | |||||
