Posey and Webster Street Tubes
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.
Excerpt from the Wikipedia article Posey and Webster Street Tubes (License: CC BY-SA 3.0, Authors).Posey and Webster Street Tubes
Mariner Square Loop,
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Geographical coordinates (GPS)
Latitude | Longitude |
---|---|
N 37.787777777778 ° | E -122.27722222222 ° |
Address
Mariner Square Loop 2295;2430
94607
California, United States
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