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. Though some maps mark SR 92's east end at State Route 185 (Mission Boulevard) and State Route 238 (Foothill Boulevard) in Hayward, control of segments of those three highways were relinquished to the city. SR 92 has interchanges with three freeways: Interstate 280 (Junipero Serra Freeway), U.S. Route 101 (Bayshore Freeway) in or near San Mateo, and Interstate 880 (Nimitz Freeway) in Hayward. It also connects indirectly to Interstates 238 and 580 by way of Foothill Boulevard.

Route description

Route 92 is defined as follows in section 392, subsection (a), of the California Streets and Highways Code, last amended by the California State Legislature in 2016:

Route 92 is from: (1) Route 1 near Half Moon Bay to Route 280. (2) Route 280 to Route 238 in Hayward.

Subdivision (b) states that control of the relinquished former eastern segment of Route 92 between near Atherton Street and Mission Boulevard in Hayward is no longer officially part of the state highway system, but the city must still "maintain within its jurisdiction signs directing motorists to the continuation of Route 92 or to the state highway system, as applicable". Subdivision (c) also permits the state to relinquish additional segments within Hayward (which occurred in 2017 when the segment from Santa Clara Street to near Atherton Street was also turned over to the city).

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.

History The alignment was designated as Legislative Route Number 105 by Caltrans in 1933.

The San Mateo section also was referred to as the 19th Avenue Freeway which was the street name where the freeway now exists. 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. 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.

In 2012, the California Legislature relinquished control of SR 92 between Atherton Street and SR 238 (Mission Boulevard) in Hayward to the city. The segment of the highway from Santa Clara Street to near Atherton Street was also turned over to the city in 2017.

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

California State Route 92

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