San Mateo–Hayward Bridge

Infobox_Bridge
bridge_name= San Mateo-Hayward Bridge


caption= Bridge as seen from San Mateo looking east
official_name=
also_known_as=
carries= 6 lanes of SR 92
crosses= San Francisco Bay
locale= Foster City, California and Hayward, California
maint= Caltrans
id=
design=
mainspan=
length= 11,265.41 meters (36,960 ft)
width=
clearance=
below= 41 meters (135 ft)
traffic= 93,000
open= October 1967
closed=
toll= $4.00 (westbound) (FasTrak)
map_cue= San Francisco Bay Bridges
map_

---

map_text=
map_width= 180px
lat= 37.5910
long= -122.2429

The San Mateo-Hayward Bridge (commonly called the San Mateo Bridge) is a bridge crossing California's San Francisco Bay in the United States, linking the San Francisco Peninsula with the East Bay. More specifically, the bridge's western end is in Foster City, the most recent urban addition to the eastern edge of San Mateo. The eastern end of the bridge is in Hayward. It is the longest bridge in the San Francisco Bay Area and the 25th longest in the world by length. The bridge is owned by the state of California, and is maintained by Caltrans, the state highway agency.

The bridge is part of State Route 92, whose western terminus is at the town of Half Moon Bay on the Pacific coast. Its principal function is to link Interstate 880 in the East Bay with U.S. Route 101 on the Peninsula. It is roughly parallel to and lies between the San Francisco – Oakland Bay Bridge and the Dumbarton Bridge, and is sometimes used by commuters to avoid traffic delays due to emergencies on those bridges.

History and description

The original bridge was built in 1929, and upon completion was the longest bridge in the world. The original bridge was mostly a two-lane causeway with a convert|300|ft|m|sing=on vertical lift span over the main shipping channel. The bridge originally had pole lights along the entire stretch, which were later abandoned except over the vertical lift span. It was subsequently replaced with a modern span in 1967. The total length of the bridge is Convert|7.0|mi|km|1. The Convert|1.9|mi|km|1 highrise section, forming the western end of the bridge, is composed of multiple steel girder spans. The eastern trestle portion accounts for the remaining Convert|5.1|mi|km|1|abbr=on|abbr=on of the overall length. The shipping channel beneath the highrise is Convert|750|ft|m|0 wide with a vertical clearance of Convert|135|ft|m|0. The bridge recently underwent an extensive seismic retrofitting to protect against earthquake damage. The bridge carries about 93,000 cars and other vehicles on a typical day.

The highrise section was initially built with six lanes and the eastern causeway with four lanes (two in each direction). The causeway section was a perennial traffic bottleneck until it was expanded to six lanes in 2004, along with much needed improvements in its connections with Interstate 880 in Hayward.

Bus service over the bridge is provided by AC Transit's Line M transbay service.

High-voltage power lines built by PG&E parallel the bridge all the way across the bay. They provide power to the Peninsula and San Francisco.

Tolls

As of 2008, the toll is $4, and is collected for westbound traffic only. During peak traffic hours the two left lanes are designated HOV lanes allowing carpool vehicles carrying two or more people (two persons in two seater cars) or motorcycles to pass for free. The three adjacent lanes are FasTrak-only lanes. During non-peak hours, the two HOV lanes become FasTrak-only lanes.

External links

* [http://bata.mtc.ca.gov/bridges/sm-hayward.htm Bay Area Toll Authority bridge facts]
* [http://www.bayareafastrak.org/static/facilities/sm.shtml FasTrak - San Mateo-Hayward Bridge]

Crossings navbox
structure = Crossings
place = San Francisco Bay
bridge = San Mateo-Hayward Bridge
bridge signs =
upstream text = South
upstream = Dumbarton Bridge
upstream signs =
downstream text = North
downstream = San Francisco – Oakland Bay Bridge
downstream signs =