The Parkfield-Coalinga Road Bridge (44C0141) crosses over Little Cholame Creek, which is also the surface trace of the San Andreas Fault (the source of these recurring earthquakes). The fault is right lateral, which means when you face it, the plate across from you is moving to the right (see figure below). Therefore, a bridge crossing a right lateral fault would eventually have a flattened 'S' shape.
Professor Goel reported that after the 2004 earthquake, "Angle iron apparently installed in an effort to restrain transverse motion of the superstructure at the bearings was knocked free."
I took photos of the abutments and piers to try to understand what happens to a bridge over a fault.
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