The Los Gatos Creek Bridge Project replaced the existing steel and timber rail track bridge, which spans Los Gatos Creek in San Jose, with a precast concrete girder bridge. The project scope included demolition and removal of the existing two-track rail bridge located immediately south of Caltrain’s Diridon Station, and installing three separate concrete pre-stressed/precast box girder bridges in its place. The new spans are supported on cast-in-drilled-hole (CIDH), and cast-in-steel-shell (CISS) piles, as well as, cast-in-place concrete piers, caps, and abutments. All work performed within the creek occurred during the June 15 to October 15 “creek work window”. In addition to the bridge replacement work, the project involved constructing a new tail track, and reconstructing segments of the mainline tracks, including the installation of a new No. 10 turnout, and reconfiguration of the existing rail signal system. The project also required installing two separate retaining wall systems along the creek bank, earthwork and slope stabilization in order to widen the hydraulic opening of the bridge, temporary access roads and ramps to access the work, new plantings, in-stream rock weirs, and other environmental mitigation efforts.