High Street Bridge Explained

High Street Bridge
Coordinates:37.7645°N -122.225°W
Carries:Cars and trucks on High Street
Crosses:Oakland Estuary
Locale:San Francisco Bay Area
Design:Double-leaf bascule
Material:Steel
Length:250feet
Width:37feet overall
24feet roadway
6feet sidewalk
Clearance Above:15inchesft6inchesin (ftin)
Clearance Below:14inchesft6inchesin (ftin) (high tide)
21feet (low tide)
Lanes:2
Builder:Harrison Bridge Company
Open:1894, December 1939
Rebuilt:1901, 1939
Traffic:30,000

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 annually and carries an average of 26,000 vehicles per year. It was built when the Oakland Estuary was trenched, converting Alameda from a peninsula to an island.

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

History

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.

After the three bridges were completed, they were left closed to allow road and rail traffic to pass, but never opened for marine traffic.[1] 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] [3] After pressure was applied by Senator George Clement Perkins and Congressman Joseph R. Knowland,[4] the federal government turned the bridges over to Alameda County in 1910, conditioned on the county assuming responsibility for maintenance, staffing, and operation.[5]

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.[6] 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 of lead-based paint.

Design

The bridge normally opens both leaves to 45°, which accommodates most marine traffic; the maximum opening for each leaf is 76°. It is designed to safely operate in wind speeds of up to .

Each leaf may be operated independently, allowing marine traffic to pass in case one leaf is inoperable. Each leaf has a 75hp main motor using electricity from Alameda Municipal Power, and a 5hp emergency motor for each leaf is powered from Pacific Gas and Electric; using counterweights, full operation is possible using emergency power.

Notes and References

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