Posey and Webster Street Tubes
Underwater tunnels in California / From Wikipedia, the free encyclopedia
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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.
Overview | |
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Location | Alameda, California and Oakland, California |
Coordinates | 37°47′16″N 122°16′38″W |
Route | SR 260 (Signed as SR 61) |
Crosses | Oakland Estuary |
Operation | |
Work begun | 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 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.