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.

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.

[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.