High Street Bridge

Last updated
High Street Bridge
High St Bridge aerial view - Alameda-Oakland, CA (2010).jpg
Aerial view in 2010
Coordinates 37°45′52″N122°13′30″W / 37.7645°N 122.2250°W / 37.7645; -122.2250 Coordinates: 37°45′52″N122°13′30″W / 37.7645°N 122.2250°W / 37.7645; -122.2250
CarriesCars and trucks on High Street
Crosses Oakland Estuary
Locale San Francisco Bay Area
Characteristics
DesignDouble-leaf bascule
MaterialSteel
Total length250 ft (76 m)
Width37 ft (11 m) overall
24 ft (7.3 m) roadway
6 ft (1.8 m) sidewalk
Clearance above 15 ft 6 in (4.72 m)
Clearance below 14 ft 6 in (4.42 m) (high tide)
21 ft (6.4 m) (low tide)
No. of lanes 2
History
Constructed byHarrison Bridge Company
Opened1894, December 1939
Rebuilt1901, 1939
Statistics
Daily traffic 30,000
Location
High Street Bridge

The High Street Bridge is a double-leaf bascule drawbridge spanning 296 feet of the Oakland Estuary in the San Francisco Bay Area, California, United States. It links the cities of Oakland and Alameda. The bridge is opened approximately 1,400 times a year. The bridge carries an average of 26,000 vehicles per year. The bridge was built when the Oakland Estuary was trenched, converting Alameda from a peninsula to an island.

Contents

The High Street Bridge is one of the four bridges and two tunnels that allow access to Alameda.

History

The bridge in 2003 High Street Bridge from north (2003).jpg
The bridge in 2003

The estuary was originally spanned by an iron swing bridge, completed in 1894 by the Harrison Bridge Company for $24,747. In May 1901 a fire destroyed the swing span and part of the approaches, which were rebuilt the following year. Three bridges were built by the federal government in 1901 at High Street (road), Park Street (road), and Fruitvale Avenue (combined road and rail) in exchange for permission and rights-of-way to dredge the channel between San Antonio Creek and San Leandro Bay. [1]

After the three bridges were completed, they were left closed to allow road and rail traffic to pass, but never opened for marine traffic. [2] [3] The northern approach to the High Street Bridge was destroyed by a fire in May 1909, which also damaged the bridge; repairs were performed late in 1909. [2] [4] [5] After pressure was applied by Senator George Clement Perkins and Congressman Joseph R. Knowland, [6] the federal government turned the bridges over to Alameda County in 1910, conditioned on the county assuming responsibility for maintenance, staffing, and operation. [3]

The present bridge was designed by the County of Alameda Surveyors Office and constructed under the Federal WPA Program in 1939 at a cost of $750,000. [1] It opened in December 1939. [7]

The bascule bridge was modernized in 1981 and 1996. The 1981 project included upgrades to electrical systems and motors; the 1996 project completely repainted the bridge, removing over 25,000 pounds (11,000 kg) of lead-based paint. [1]

Design

The bridge normally opens both leaves to 45°, which accommodates most marine traffic; the maximum opening for each leaf is 76°. [1] It is designed to safely operate in wind speeds of up to 30 miles per hour (48 km/h). [1]

Each leaf may be operated independently, allowing marine traffic to pass in the event that one leaf is inoperable. [1] Each leaf has a 75-horsepower (56 kW) main motor using electricity from Alameda Municipal Power, and a 5-horsepower (3.7 kW) emergency motor for each leaf is powered from Pacific Gas and Electric; using counterweights, full operation is possible using emergency power. [1]

Related Research Articles

Alameda, California City in California in the United States

Alameda is a city in Alameda County, California, United States. It spans Alameda Island and Bay Farm Island. It is adjacent to and south of Oakland and east of San Francisco across the San Francisco Bay. Bay Farm Island, a portion of which is also known as "Harbor Bay Isle", is part of the mainland adjacent to Oakland International Airport. The city's estimated 2019 population was 77,624. Alameda is a charter city, rather than a general law city and adopted a council–manager government in 1916.

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MacArthur Maze

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Coast Guard Island

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East Bay Electric Lines

The East Bay Electric Lines were a unit of the Southern Pacific Railroad that operated electric interurban-type trains in the East Bay region of the San Francisco Bay Area. Beginning in 1862, the SP and its predecessors operated local steam-drawn ferry-train passenger service in the East Bay on an expanding system of lines, but in 1902 the Key System started a competing system of electric lines and ferries. The SP then drew up plans to expand and electrify its system of lines and this new service began in 1911. The trains served the cities of Berkeley, Albany, Emeryville, Oakland, Alameda, and San Leandro transporting commuters to and from the large Oakland Pier and SP Alameda Pier. A fleet of ferry boats ran between these piers and the docks of the Ferry Building on the San Francisco Embarcadero.

The Posey and Webster Street tubes are two parallel underwater tunnels connecting the cities of Oakland and Alameda, California, running beneath the Oakland Estuary. Both are immersed tubes, constructed by sinking precast concrete segments to a trench in the Estuary floor, then sealing them together to create a tunnel. The Posey tube, completed in 1928, currently carries one-way (Oakland-bound) traffic under the Estuary, while the Webster tube, completed in 1963, currently carries traffic from Oakland to Alameda.

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Park Street Bridge

The Park Street Bridge is a double-leaf bascule drawbridge spanning 372 feet of the Oakland Estuary in the San Francisco Bay Area. It links the cities of Oakland and Alameda. In a year, the bridge is opened approximately 1700 times and carries approximately 40,000 vehicles per work day. It was built when the Oakland Estuary was trenched, converting Alameda from a peninsula to an island.

Fruitvale Bridge Bridge between Alameda and Oakland, California, U.S.

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The Santa Fe Railroad barged rail cars across the San Francisco Bay for much of the 20th century as there is no direct rail link to the San Francisco peninsula. In the post World War II period a fleet of three tugs moved the barges: the Paul P. Hastings, the Edward J. Engel, and the John R. Hayden. After cross-bay float service had ended and the tugs had been sold, the Hastings sank off Point Arena, California in water too deep to raise. The Engel sank off Alameda, California and is expected to be raised. The Hayden remains afloat and in service in Oregon.

Portola Road Race

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Alameda (island)

Alameda Island is an island in the San Francisco Bay in California. It is south and west of, and adjacent to Oakland, and across the bay eastward from San Francisco. Located on the island is most of the city of Alameda, a city in Alameda County. A very small western tip of the island's territory is technically part of San Francisco, however this is uninhabited and is not separately managed. Once located on the island is the Naval Air Station Alameda, a defunct naval air station. The island was originally a peninsula and a part of Oakland, and is now separated from the mainland by the Oakland Estuary. The island is connected to the mainland by four bridges: the Park Street Bridge, Fruitvale Bridge, High Street Bridge, and Bay Farm Island Bridge. The Posey and Webster Street tubes also connect Oakland to Alameda Island.

Eighth Street Bridge (Passaic River)

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Rio Vista Bridge

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Bay Farm Island Bridge

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Barra Strait Bridge Canadian bascule road bridge

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References

  1. 1 2 3 4 5 6 7 "High Street Bridge". ACPWA.org. Alameda County Public Works Agency. Retrieved 13 November 2012.
  2. 1 2 "Government May Give Canal Bridges to City". San Francisco Call. 106 (176). 23 November 1909. Retrieved 2 May 2017.
  3. 1 2 "Bridges will be open to traffic". San Francisco Call. 108 (86). 25 August 1910. Retrieved 2 May 2017.
  4. "High Street Bridge will be repaired". San Francisco Call. 106 (50). 20 July 1909. Retrieved 2 May 2017.
  5. "High Street Bridge is being repaired". San Francisco Call. 106 (164). 11 November 1909. Retrieved 2 May 2017.
  6. "Urge Congress to Deliver Bridges". San Francisco Call. 107 (28). 28 December 1909. Retrieved 2 May 2017.
  7. "Henderson's Kin Designs New Bridge". Healdsburg Tribune, Enterprise and Scimitar. 11 December 1939. Retrieved 2 May 2017.