Lafayette Pedestrian Bridge

Location
Portland, OR
Owner

TriMet

Architect

Merryman Barnes Architects

Contractor

Stacy and Whitbeck

Services/Project Type
Roads and Bridges
Transit
Bridges
Pedestrian Bridges
Surface Water Management

KPFF provided structural and civil engineering design and construction support for this new 185-ft long custom weathering steel truss pedestrian bridge over the Union Pacific Railroad (UPRR) tracks in Portland. The distinctive design features an ADA-accessible 12-ft wide walkway spanning between new weathering steel and glass elevator towers with galvanized steel stair structures accessing the bridge from the side. KPFF collaborated with local steel fabricators to develop a customized design optimized for economy, fabrication, constructability, and maintenance. Overall weight and foundation requirements were minimized, allowing for an inexpensive shallow bearing foundation on one end, with an efficient pile-supported foundation straddling over a 100 year old, 6’-0” diameter sewer line at the other end. The bridge was successfully lifted into place during a single brief rail closure, without need for temporary shoring. Civil improvements included design of curb returns and sidewalks adjacent to the pedestrian bridge and elevator entrances, sanitary sewer and water utility services, water quality facilities, and erosion control.

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