Astoria Waterfront Bridge Replacements
This project replaced six structurally deficient bridges in Astoria with modern structures supported on steel piles built to current design standards. The structures provide a critical connection between city streets and the riverfront wharf, linking pedestrian and vehicle traffic to businesses and attractions. Deterioration and load posting on the old timber trestles had severely restricted the use of the wharf and impacted riverfront redevelopment.
During design, it quickly became clear that construction impacts to environmentally sensitive areas and marine animals were a key consideration. Along with the range of typical environmental permitting, our environmental specialists led the preparation of an Incidental Harassment Authorization (IHA) to allow construction to occur in compliance with the Marine Mammal Protection Act. This was ODOT’s first IHA.
- Our inspectors were instrumental in identifying the deficiencies, and we helped the City secure ODOT funding for the bridge replacements by preparing detailed cost estimates.
- The unique, vintage seawalls at the shore end of each bridge were also deteriorated, and we designed rehabilitations to the concrete and timber seawalls.
- A total of eight environmental, historical, and archeological studies, reports, and approvals were required on this project.
environmental, historical, and archeological studies, reports, and approvals were required on this project.