Project Details

Owner: City and County of San Francisco

Contract value: $18,860,000

Description

The project provided railroad and vehicular traffic access to Pier 80. The design and construction of the Illinois Street Bridge included two 11 ft wide traffic lanes with a shared centerline railroad track. The 525 ft long bridge has 40 ft spans set on deep steel pile foundations with concrete pile caps. The superstructure consists of steel girders and a concrete deck and an 85 ft long movable span that provides a 65 ft wide clear navigable channel for boat traffic. The span is a single leaf bascule non-counterweighted lift assembly and the bascule has been designed to be operated via hydraulic cylinders.

The movable span consists of two 7 ft deep plate girders and rotates on 24 in forged trunnion shafts set in large, spherical, self-lubricated bearings. The total weight of the movable span is 400,000 pounds, with the largest single erection pieces weighing 60,000 pounds. Additional elements included the installation of traffic, train, and bridge controls and signalization to handle the various modes of bridge operation, the realignment and improvements of Illinois Street to the north and south of Islais Creek, and various new intersection construction.