Posey and Webster Street Tubes
From Wikipedia, the free encyclopedia
| Posey Tube | |
|---|---|
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| Carries | 2 lanes of SR 260 Northbound (Signed as SR 61) |
| Crosses | Oakland Estuary |
| Locale | Alameda, California and Oakland, California |
| Maintained by | California Department of Transportation |
| Opening date | October 27, 1928 |
| Coordinates | |
| Webster Street Tube | |
|---|---|
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| Carries | 2 lanes of SR 260 Southbound (Signed as SR 61) |
| Crosses | Oakland Estuary |
| Locale | Alameda, California and Oakland, California |
| Maintained by | California Department of Transportation |
| Opening date | 1963 |
The Posey Tube and the Webster Street Tube are two parallel underwater tunnels connecting the cities of Oakland and Alameda, California, running beneath the Alameda-Oakland Estuary. Currently, the Posey Tube carries Oakland-bound traffic under the Estuary, while the Webster Tube carries traffic bound for Alameda.
The Posey Tube is the second-oldest underwater vehicular tunnel in the US, preceded only by the Holland Tunnel.
[edit] Construction
The Posey Tube, completed and opened to traffic on October 27, 1928, was named after George Posey, Alameda County Surveyor during the tunnel's planning and construction, and also chief engineer on the construction project. The Webster Street Tube opened in 1963 to deal with the increased traffic between Oakland and 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.
The design was modeled on that of the Holland Tunnel, and Ole Singstad (who had designed the pioneering ventilation system of the Holland Tunnel) consulted.[1]
[edit] Notes
[edit] References
- Posey Tube and Webster St Tube at AlamedaInfo.com by Gary Lenhart (includes detailed timeline and historical photographs)
- Bjork, Kenneth (1947), Saga in Steel and Concrete: Norwegian Engineers in America, <http://www.naha.stolaf.edu/>
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