Sunday, January 10, 2016

Marin County, California Bridges: The Richardson Bay Bridge

There aren't too many long bridges in Marin County. The Richardson Bay Bridge is a 873 ft long precast girder bridge (with a few box girder and T girder spans) that was built in 1957 and widened in 1973. It carries busy US-101 north of the Golden Gate Bridge through the affluent Mill Valley. Like a lot of other long bridges, the Richardson Bay Bridge has mostly flexible piers that alternate with occasional stiff lateral restraining piers. Despite or because of this kind of seismic design, the bridge suffered moderate damage during the 1989 Loma Pieta earthquake, but that didn't result in closure. After the earthquake, Caltrans provided a retrofit that consisted of infill walls to resist the lateral load.
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Marin County, California Bridges: The Richardson Bay Bridge by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.


Unknown said...

I still see signs in both directions saying bicycles exit here on the birst exit over the bridge in either direction. Either you can ride your bike there or Caltrans hasn't gotten around to removing signs.

Mark Yashinsky said...

Beats me.