Orion was contracted by the Seattle Department of Transportation to replace the Fairview Avenue North bridge structure. Our team demolished the existing bridge, which consisted of an eastern concrete pile supported bridge built in 1964, and a western timber pile-supported bridge built in 1948. The team removed existing concrete rubble along the Lake Union shoreline and placed a cap of clean sand within the project area.

Orion replaced the existing bridge with a 540-foot-long and 67-foot-wide multi-span concrete bridge. The new bridge is supported by 3.5-foot-diameter reinforced concrete bridge columns. Each column was constructed on a foundation consisting of an 8-foot-diameter drilled shaft installed to an approximate depth of 140 feet below the water surface elevation. The project also required relocation of aboveground utilities to construct the project. Overhead transmission were temporarily relocated to facilitate construction.

Stormwater treatment vaults equipped with Prefilter cartridge systems were installed at each approach to intercept and treat stormwater from the bridge deck. Orion self-performed the installation of the stormwater vaults with cartridge systems, conveyance piping, and outfalls where none existed. Historical land use practices required pre-screening, management, testing, and off-site disposal of soils.

This project was awarded the National Public Works Project of the Year Award by the American Public Works Association in 2022.