Klaskanine River Bridge Astoria, Oregon

Replacing an original seven-span structure, the three-span Klaskanine River Bridge provides efficient crossing as part of a complex bridge geometry. Coordinating expertise across disciplines, Otak led a collaborative and centralized approach, delivering a design that enhances roadway engineering while mitigating floodplain impacts.

A Collaborative Approach to Bridge Design for a Complex Site

The final design used a multi-span, cast-in-place concrete bridge that balanced roadway alignment with hydraulic clearance. Design challenges included considerations for a tsunami inundation hazard that was identified for the site, along with the presence of a deep deposit of soft, estuarine soils which required that the structure be supported by pile foundations driven into bedrock. A SFLP (State Funded Local Project), regular monthly discussions and reporting on progress throughout the process streamlined decision making. Expanding direct involvement to survey, geotechnical, environmental permitting, and hydraulic analysis as part of a centralized approach to construction led to a more efficient delivery.