# California State Route 92

State Route 92 (SR 92) is a state highway in the U.S. state of California, serving as a major east-west corridor in the San Francisco Bay Area. From its west end at State Route 1 in Half Moon Bay near the coast, it heads east across the San Francisco Peninsula and the San Mateo–Hayward Bridge to downtown Hayward in the East Bay at its junction with State Route 238 and State Route 185. It has interchanges with three freeways: Interstate 280 (the Junipero Serra Freeway), U.S. Route 101 (the Bayshore Freeway) in or near San Mateo, and Interstate 880 (the Nimitz Freeway) in Hayward. It also connects indirectly to Interstates 238 and 580 by way of Hayward's Foothill Boulevard, which carries Route 238 and flows directly into Route 92.

## Route description

Between Half Moon Bay and Interstate 280, Route 92 winds through the Coast Range as a narrow, mainly undivided two and three lane highway with a switchback turn. The east-bound uphill portion was upgraded with a long passing lane. Between Interstate 280 and Interstate 880 it is entirely a divided multilane highway, including the toll San Mateo-Hayward Bridge, the longest span across the San Francisco Bay; west of that bridge, Route 92 is carried on twin girder bridges across Seal Slough, which forms the border between the cities of San Mateo and Foster City. East of Interstate 880 the route becomes a divided surface street in Hayward, locally known as Jackson Street.
State Route 92 traverses through significant habitat areas including wetland, California oak woodland, chaparral and grassland. In one serpentine soil location near Crystal Springs Reservoir, it passes near one of the only known colonies of the endangered wildflower Pentachaeta bellidiflora and near one of the limited number of colonies of the endangered Eriophyllum latilobum.
SR 92 is part of the California Freeway and Expressway System, and a small portion near SR 1 as well as the entire portion east of I-280 are 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. SR 92 is eligible for the State Scenic Highway System, but it is not officially designated as a scenic highway by the California Department of Transportation.
* Aerial views of SR 92
* View directed east, showing US 101 interchange, serpentine Seal Slough, and the San Mateo Bridge
* View directed west near interchange with I-280, showing Crystal Springs Reservoir and route from San Mateo to Half Moon Bay
* View directed east c. 1962, showing 19th Avenue Freeway segment under construction; the Antoine Borel family estate is the wooded area north (left) of the new freeway
* View directed west as-completed c. 1963, showing full cloverleaf interchange with SR 82, center, and bridges over SP's Peninsula Corridor
* View directed north over Hayward; SR 92 runs along bottom right corner

## History

The alignment was designated as Legislative Route Number 105 by Caltrans in 1933.$^{:16–17}$
The San Mateo section also was referred to as the 19th Avenue Freeway which was the street name where the freeway now exists.$^{:22}$ Parts of the street remain. This section is also known as the J. Arthur Younger Freeway; J. Arthur Younger was a United States representative who served during the 1950s and 60s.$^{:III-2}$ On August 29, 1963, the 19th Avenue segment was completed and by 1964, the present name had been adopted; planning began for the segments in Alameda County, east of the San Mateo–Hayward Bridge, and the remainder in San Mateo County, west of Interstate 280.$^{:30,41}$

### Updates

An upgrade of the intersection with Main Street in Half Moon Bay, near the western terminus, was scheduled to be completed by fall 2008.
The old cloverleaf interchange with Interstate 880 was converted into a three-level combination interchange with direct ramp replacements for two of the tight "cloverleaf" ramps, and a new wider and taller overpass to carry Route 92 over Interstate 880. The project took four years and was completed in October 2011.
A similar cloverleaf interchange at SR 82 (El Camino Real) was rebuilt in 2018 into a partial cloverleaf interchange. Two of the loop off-ramps from SR 92 were eliminated: from westbound SR 92 to northbound El Camino Real, and from eastbound SR 92 to southbound El Camino Real. The remaining off-ramps were widened and signalized to allow left and right turns onto El Camino Real.
Planning for improvements to the interchange with the Bayshore Freeway (U.S. 101) began in 2018; construction is scheduled to begin in 2024. In addition, a separated bikeway will be built on Fashion Island Boulevard, which largely follows the former alignment of 19th Avenue, connecting the cities of Foster City and San Mateo. This project is scheduled to be completed by the end of 2026.

## 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 (for a full list of prefixes, see California postmile § Official postmile definitions). Segments that remain unconstructed or have been relinquished to local control may be omitted. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.
| County | Location | Postmile | Exit | Destinations | Notes |
| San Mateo SM 0.00-R18.80 | Half Moon Bay | 0.00 | | SR 1 – San Francisco, Santa Cruz | Western terminus |
| San Mateo SM 0.00-R18.80 | Half Moon Bay | 0.20 | | Main Street – Downtown Half Moon Bay | Former SR 1 |
| San Mateo SM 0.00-R18.80 | ​ | 5.19 | | SR 35 south (Skyline Boulevard) – Big Basin | West end of SR 35 overlap |
| San Mateo SM 0.00-R18.80 | ​ | 7.19 | | SR 35 north (Skyline Boulevard) – San Francisco | East end of SR 35 overlap |
| San Mateo SM 0.00-R18.80 | ​ | | Western end of freeway | Western end of freeway | Western end of freeway |
| San Mateo SM 0.00-R18.80 | ​ | R7.31 | 8 | I-280 (Junipero Serra Freeway) – San Francisco, San Jose | Access from I-280 south to SR 92 west is via SR 35; signed as exits 8A (south) and 8B (north) eastbound; I-280 exit 33 |
| San Mateo SM 0.00-R18.80 | San Mateo | R7.93 | 9A | Ralston Avenue – Belmont | Former Legislative Route 214 |
| San Mateo SM 0.00-R18.80 | San Mateo | R8.67 | 9B | De Anza Boulevard, Polhemus Road | |
| San Mateo SM 0.00-R18.80 | San Mateo | R9.38 | 10 | West Hillsdale Boulevard | |
| San Mateo SM 0.00-R18.80 | San Mateo | R10.56 | 11 | Alameda de las Pulgas | |
| San Mateo SM 0.00-R18.80 | San Mateo | R11.21 | 12A | SR 82 (El Camino Real) | Formerly signed as exits 12A (south) and 12B (north) |
| San Mateo SM 0.00-R18.80 | San Mateo | R11.61 | 12B | Delaware Street | Formerly signed as exit 12C |
| San Mateo SM 0.00-R18.80 | San Mateo | R12.14 | 13A | US 101 south (Bayshore Freeway) – San Jose | US 101 exit 414B |
| San Mateo SM 0.00-R18.80 | San Mateo | R12.14 | 13B | US 101 north (Bayshore Freeway) – San Francisco | US 101 exit 414B |
| San Mateo SM 0.00-R18.80 | Foster City | R12.78 | 14A | Mariners Island Boulevard, Edgewater Boulevard | |
| San Mateo SM 0.00-R18.80 | Foster City | R13.61 | 14B | Foster City Boulevard, East Hillsdale Boulevard | |
| San Francisco Bay | San Francisco Bay | R14.44– R0.00 | San Mateo–Hayward Bridge (westbound toll only) | San Mateo–Hayward Bridge (westbound toll only) | San Mateo–Hayward Bridge (westbound toll only) |
| Alameda ALA R0.00-8.22 | Hayward | R4.48 | 24 | Clawiter Road, Eden Landing Road | |
| Alameda ALA R0.00-8.22 | Hayward | R5.12 | 25A | Industrial Boulevard | |
| Alameda ALA R0.00-8.22 | Hayward | R5.76 | 25B | Hesperian Boulevard – San Lorenzo | |
| Alameda ALA R0.00-8.22 | Hayward | 6.39 | 26A | I-880 south (Nimitz Freeway) – San Jose | I-880 exit 27; former SR 17 |
| Alameda ALA R0.00-8.22 | Hayward | 6.39 | 26B | I-880 north (Nimitz Freeway) – Oakland | I-880 exit 27; former SR 17 |
| Alameda ALA R0.00-8.22 | Hayward | | Eastern end of freeway | Eastern end of freeway | Eastern end of freeway |
| Alameda ALA R0.00-8.22 | Hayward | 6.78 | | Santa Clara Street | Serves CSU East Bay |
| Alameda ALA R0.00-8.22 | Hayward | 8.22 | | SR 185 / SR 238 (Mission Boulevard, Foothill Boulevard) to I-580 | Eastern terminus; access to SR 185 is via a left turn on A Street from SR 238 north |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus Electronic toll collection Incomplete access ||||||