BN1ONLB27_SPECS_ADVERTISE.pdf

This is a specifications document for the Bonneville Lock and Dam Navigation Lock 1 Bridge Replacement project. The project requires the replacement of an existing bridge with a new fixed single-span steel girder bridge featuring a concrete deck. The new bridge will be 34'4" out-to-out with two 11'0" travel lanes, two 2'0" shoulders, a 5'0" sidewalk, and a superstructure consisting of four built-up steel plate girders. The replacement bridge will be positioned on a new alignment immediately downstream of the existing structure and must fit between the current bridge and an adjacent Bonneville Power Administration transmission tower.

The project involves significant environmental and constructional complexities, including the north abutment designed as a concrete stub abutment with spread footing anchored into rock and the south abutment supported by drilled shafts. Critical requirements include lead and asbestos removal, seismic hazard mitigation through partial demolition of the existing bridge, phased construction to maintain continuous vehicular access to the Bonneville project throughout the work period, operation within environmental and seasonal restrictions, and use of barge crane lifting in close proximity to high voltage power lines. The Army Corps of Engineers Portland Engineering District is the administering federal agency for this solicitation numbered W9127N26BA024.