Third Street Bridge Over Mission Creek, San Francisco, CA

The approximately 295-foot long, 80-foot wide Third Street Bridge (Caltrans Bridge No. 34C0025) spans the Mission Creek Channel; providing five traffic lanes (three going southbound, two northbound.) The bridge uses a bascule arm to act as an active conduit for vehicles, pedestrians, and cyclists; opening to allow boats to pass along Mission Creek Channel (a Coast Guard‐regulated, navigable waterway with limited marine traffic.) Constructed in the 1930s, this heel trunnion bascule drawbridge was designed and patented by the Strauss Engineering Corporation, and is a San Francisco Landmark (#194), listed in the Caltrans Historic Bridge Inventory as a Category 2 bridge. It has been determined by Caltrans as eligible for listing in the National Register of Historic Places (NRHP).

PARIKH provided geotechnical and seismic studies for the 3rd Street Bridge at AT&T Park in San Francisco. The bridge and the fender systems are supported on timber piles which require seismic retrofit. The study included water-based exploration, deep borings, liquefaction study, site specific ARS curves, and foundation recommendations for the retrofit work. PARIKH worked with the City and County of San Francisco for all the work, including field and water-based explorations, obtaining Coast Guard permits, and use of a floating CPT rig.