June 15, 1925 (1925-06-15) (Posey) October 12, 1959 (1959-10-12) (Webster)
Opened
October 27, 1928 (1928-10-27) (Posey) February 13, 1963 (1963-02-13) (Webster)
Operator
California Department of Transportation
Technical
Length
3,545.1 feet (1,080.5 m)[1]
No. of lanes
2 per tube
Tunnel clearance
14.67 feet (4.47 m) (Posey Tube) 14.83 feet (4.52 m) (Webster St. Tube)
Route map
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 Street Tube, completed in 1963, carries traffic from Oakland to Alameda.
The Posey Tube is the second-oldest underwater vehicular tunnel in the US, preceded only by the Holland Tunnel. It is the oldest immersed tube vehicular tunnel in the world.
^Baughn, James. "Posey Tube". Bridgehunter. Retrieved 19 March 2019.
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Global Information
SR 260
SR 61)