Beaver Creek Bridge Twisp, Washington

The Beaver Creek Bridge, located on Hwy 47, is approximately 10 miles south of Vernonia, Oregon. Due to structural deficiency and stream constriction the single span bridge would be replaced.

A Seismic-Resilient Replacement for a Bridge with Structural Deficiency

Due to a deep soft layer of soil discovered during geotechnical explorations, the bridge is design to be supported on piling while the abutments are supported by tied back sheet piling. This is to preclude lateral spreading during a seismic event. Additionally, cellular concrete will be used for a portion of the roadway fill to minimize settlement. Rapid bridge construction techniques were incorporated into the project to limit the overall road closure time to two months.