Posey and Webster Street Tubes
From Wikipedia, the free encyclopedia
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| Carries | 2 lanes of CA 260 Southbound (Signed as CA 61) |
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| Crosses | Oakland Estuary |
| Locale | Alameda, California and Oakland, California |
| Maintained by | California Department of Transportation |
| Opening date | October 27, 1928 |
| Coordinates | |
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| Carries | 2 lanes of CA 260 Northbound (Signed as CA 61) |
|---|---|
| Crosses | Oakland Estuary |
| Locale | Alameda, California and Oakland, California |
| Maintained by | California Department of Transportation |
| Opening date | 1963 |
The Posey Tube is an underwater tunnel connecting the cities of Oakland and Alameda, California, running beneath the Alameda-Oakland Estuary. Completed and opened to traffic on October 27, 1928, it is named for George Posey, Alameda County Surveyor during the tunnel's planning and construction, and also chief engineer on the construction project.
To deal with the increased traffic between Oakland and Alameda, the parallel Webster Street Tube was completed and opened in 1963. Currently, the Posey Tube carries Oakland-bound traffic under the Estuary, while the Webster Tube carries traffic bound for Alameda.
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.
[edit] References
- Posey Tube and Webster St Tube at AlamedaInfo.com by Gary Lenhart (includes detailed timeline and historical photographs)
