Like the San Mateo Bridge to the north, power lines parallel the bridge. ==History and engineering features== The bridge has never been officially named, but its commonly used name comes from Dumbarton Point, named in 1876 after Dumbarton, Scotland.
Built in 1910, the rail bridge has been unused since 1982 and its western approach collapsed in a fire in 1998.
The earlier bridge opened on January 17, 1927, and was the first vehicular bridge to cross San Francisco Bay.
When it opened, the original 1927 span had a toll of $0.40 per car plus $0.05 per passenger.
The original bridge was built with private capital and then purchased by the state for $2.5 million in 1951. Its age and the two-lane undivided roadway and lift-span led to a replacement bridge being built to the north.
In 1959, tolls were set to $0.35 per car.
During non-peak hours the HOV lane is open to vehicles carrying only one person, but remains FasTrak-only. ===Historical toll rates=== Prior to 1969, tolls on the Dumbarton Bridge were collected in both directions.
It was raised to $0.70 in 1969, then $0.75 in 1976.
The free Stanford Marguerite Shuttle also runs buses AE-F and EB across the bridge. ==Environmental factors== When the current bridge was planned in the 1970s, Caltrans conducted extensive environmental research on the aquatic and terrestrial environment.
The aqueduct rises above ground in Newark at the east side of the Bay, falls below the water's surface at a pump station in Fremont, re-emerges in the middle of the Bay and then continues above water until it reaches the west side of the Bay at Menlo Park. == In popular culture == A scene of the 1970 movie Harold and Maude was filmed at the original toll plaza and showed Maude speeding and disobeying a police officer. ==References== ==External links== California Dept.
It was raised to $0.70 in 1969, then $0.75 in 1976.
The toll per car remained at $0.75 when the replacement bridge opened in the 1980s. The basic toll (for automobiles) on the seven state-owned bridges, including the Dumbarton Bridge, was raised to $1 by Regional Measure 1, approved by Bay Area voters in 1988.
This bridge opened in October 1982 as a four-lane, high-level structure.
Built in 1910, the rail bridge has been unused since 1982 and its western approach collapsed in a fire in 1998.
The center spans are twin steel trapezoidal girders which also support a lightweight concrete deck. The center span of the original bridge was demolished in a controlled explosion in September 1984. ==Roadway connections== The bridge is part of State Route 84, and is directly connected to Interstate 880 by a freeway segment north of the Fremont end. There is no freeway connection between U.S.
The toll per car remained at $0.75 when the replacement bridge opened in the 1980s. The basic toll (for automobiles) on the seven state-owned bridges, including the Dumbarton Bridge, was raised to $1 by Regional Measure 1, approved by Bay Area voters in 1988.
The structure was re-striped to accommodate six lanes on October 18, 1989, in response to the temporary closing of the San Francisco–Oakland Bay Bridge due to the Loma Prieta earthquake, and the permanent widening of the approaches was completed by July 2003.
A $1 seismic retrofit surcharge was added in 1998 by the state legislature, originally for eight years, but since then extended to December 2037 (AB1171, October 2001).
Built in 1910, the rail bridge has been unused since 1982 and its western approach collapsed in a fire in 1998.
A $1 seismic retrofit surcharge was added in 1998 by the state legislature, originally for eight years, but since then extended to December 2037 (AB1171, October 2001).
The structure was re-striped to accommodate six lanes on October 18, 1989, in response to the temporary closing of the San Francisco–Oakland Bay Bridge due to the Loma Prieta earthquake, and the permanent widening of the approaches was completed by July 2003.
On March 2, 2004, voters approved Regional Measure 2, raising the toll by another dollar to a total of $3.
A successful March 2004 regional transportation ballot measure included funding to rehabilitate the rail bridge for the commuter rail service, but in October 2008 the Metropolitan Transportation Commission transferred $91 million from this project to the BART Warm Springs extension in Fremont. ==Hetch Hetchy Aqueduct== Between the Dumbarton Bridge and the Dumbarton Rail Bridge is the Bay crossing of the Hetch Hetchy Aqueduct.
In 2007, prominent author David Halberstam was killed in one such crash at the Willow Road intersection. Access to I-280 is available via State Route 84 to Woodside Road (as signed) or other arterial routes.
An additional dollar was added to the toll starting January 1, 2007, to cover cost overruns concerning the replacement of the eastern span. The Metropolitan Transportation Commission, a regional transportation agency, in its capacity as the Bay Area Toll Authority, administers RM1 and RM2 funds, a significant portion of which are allocated to public transit capital improvements and operating subsidies in the transportation corridors served by the bridges.
A successful March 2004 regional transportation ballot measure included funding to rehabilitate the rail bridge for the commuter rail service, but in October 2008 the Metropolitan Transportation Commission transferred $91 million from this project to the BART Warm Springs extension in Fremont. ==Hetch Hetchy Aqueduct== Between the Dumbarton Bridge and the Dumbarton Rail Bridge is the Bay crossing of the Hetch Hetchy Aqueduct.
The Bay Area Toll Authority is made up of appointed officials put in place by various city and county governments, and is not subject to direct voter oversight. Due to further funding shortages for seismic retrofit projects, the Bay Area Toll Authority again raised tolls on all seven of the state-owned bridges in July 2010.
The toll rate for autos on the Dumbarton Bridge was thus increased to $5. In June 2018, Bay Area voters approved Regional Measure 3 to further raise the tolls on all seven of the state-owned bridges to fund $4.5 billion worth of transportation improvements in the area.
Under the passed measure, the toll rate for autos on the Dumbarton Bridge will be increased to $6 on January 1, 2019; to $7 on January 1, 2022; and then to $8 on January 1, 2025. In September 2019, the MTC approved a plan to eliminate toll takers and convert all seven of the state-owned bridges to all-electronic tolling, citing that 75 percent of drivers are now using Fastrak and the change would improve traffic flow.
On March 20, 2020, at midnight, due to the COVID-19 pandemic, all-electronic tolling was temporarily placed in effect for all seven state-owned toll bridges, and as of December 10, 2020, all of the state-owned toll bridges are now permanently cashless. ==Dumbarton Rail Bridge== Just to the south of the car bridge lies the Dumbarton Rail Bridge.
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