Spanning the only Portland and Western Railroad (P&W) grade-separated crossing in Columbia City, the L Street Bridge serves as a critical link between downtown Columbia City and Highway 30.
The existing bridge was an old timber trestle bridge with many deficiencies, including load restrictions and a very narrow roadway.
Replacing the outdated structure presented numerous design challenges; the clearance over the P&W railroad had to be maintained, the design had to accommodate a future rail line, and nearby roadway intersections could not be significantly modified. Furthermore, the structure's high visibility meant that the new bridge would need to be visually pleasing.
OBEC succeeded in designing a new, wider structure, with arched concrete rails and concrete "ashlar stone" retaining walls, that looks great and vastly improves this essential crossing. The bridge was recognized for its design and engineering excellence and received the 2007 Prestressed Concrete Institute Award.