The Third Street Bridge, also known as the “Lefty O’Doul Bridge”, is a bascule bridge known as a heel trunnion bascule drawbridge. It was designed and patented by the Strauss Engineering Corporation, of the same Joseph Strauss that served as Chief Engineer on the Golden Gate Bridge. Strauss Engineering constructed four of these unique bridge structures in California from 1923 to 1929 and were all placed along the Sacramento River. The bridge was opened to traveling public in 1933 and it was retrofitted in 1999, prior to the opening of the adjacent ballpark.

The Third Street Bridge is now scheduled for rehabilitation work to sustain the integrity of the bridge and to address corrosion issues. The project scope will involve repairs or replacement of damaged steel members, welds, concrete counterweights, support piles, bridge fenders, spot removal of rust and associated priming and recoating, removal and replacement of the steel bridge deck and other associated work.

With a large portion of the work occurring above or within the navigable waters of Mission Bay and the Mission Bay Channel, extensive work will be performed from barges including structural restoration both above and below the waterline.