Bonneville Navigation Lock 1 Bridge Replacement_Drawings_ADVERTISE-EDITED.pdf

This file contains technical drawings for the Bonneville Navigation Lock 1 Bridge Replacement project. The drawings illustrate a new fixed bridge design featuring a single-span steel girder structure with a concrete deck, measuring 34'4" out-to-out in width. The bridge accommodates two 11'0" travel lanes, two 2'0" shoulders, and a 5'0" sidewalk, with the superstructure consisting of four built-up steel plate girders. The northern terminus of the replacement bridge is positioned immediately downstream of the existing bridge, designed to fit entirely between the current structure and an existing Bonneville Power Administration transmission tower to the south. The north abutment will utilize a concrete stub design with spread footing anchored into rock, while the south abutment employs a concrete design supported by drilled shafts.

The drawings detail approach roadway construction required to tie into existing roadway alignment and indicate the bridge will provide greater under-clearance than the existing structure over the navigation channel. Additional elements shown in the technical documentation address phased construction requirements necessary to maintain critical vehicular access throughout the project duration, environmental and seasonal restrictions, and coordination requirements for barge crane lifting operations in close proximity to high voltage power lines. The drawings also reference requirements for lead and asbestos removal as part of the demolition and construction scope, along with seismic mitigation measures involving partial removal of the existing bridge structure.