This seems to be Benicia and Martinez, and one of the pair of bridges is I680. The Google Maps satellite photos doesn't show two bridges there, but the rest of the geography is quite distinctive. See http://maps.google.com/maps?f=q&hl=en&geocode=&q=Palo+Alto+CA&ie=UTF8&ll=38.036464,-122.137756&spn=0.098293,0.160675&t=h&z=13&om=1
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From: Mark Gritter
Date: Tue Aug 7 21:41:50 2007
There are actually three bridges there! The westernmost (left) one is the old I-680 bridge. The easternmost (right) one is the new span which will become the northbound lanes. (It might already be open, I think it was supposed to be done last year.) And in the middle is a rail bridge, which you can just make out. (The Benicia-Martinez bridge has its own Wikipedia article.) You can also see the I-80 bridge further west.
From: Eric Forste
Date: Tue Aug 7 22:45:01 2007
I need to remember to remind Pamela that this photo also includes the tiny town of Port Costa, directly left (in the photo) of and across the strait from Benicia.