Delivering Resilient, Flood Protection Solutions to the Community

Located along the mouth of the Chehalis River and Grays Harbor Estuary in western Washington state, the $182.6 million Aberdeen-Hoquiam Flood Protection Project comprises of the North Shore Levee, North Shore Levee - West Segment, and Fry Creek Pump Station. Each component of the project is critical to protecting the cities of Aberdeen and Hoquiam against coastal flooding events from the adjacent Wishkah and Hoquiam rivers. HDR is the lead designer and engineer on both levee segments and is responsible for final design of the pump station.

Grays Harbor County is one of the most economically disadvantaged communities in the state with many residents burdened by high flood insurance premiums. Flood risk in the area deters investment in the community making this project vital to long-term growth and development in both communities.

The North Shore Levee is a 4.9-mile structure across both cities that will increase flood resiliency and help retain jobs and existing business for both communities. The $100.8 million levee will bring more than 3,100 properties and over 900 businesses out of a Federal Emergency Management Agency-drawn Special Flood Hazard Area plain, saving residents more than $1 million in flood insurance premiums each year.

The North Shore Levee - West Segment will be 4.7 miles along the west side of Hoquiam. This $59.6 million segment of the project will remove $1 million in annual flood premiums from the community and protect more than 2,000 properties and 350 businesses in the area. Despite multiple updates and adjustments to the flooding models and proposed elevation, we worked with the client to raise the elevation level of the levee to 16 feet. This effort will help protect against increased flooding from the Hoquiam River, which has faced heavier storm surges and higher tides in recent years.

The Fry Creek Pump Station is a crucial component of coastal flood protection and storm drainage in both cities. The new $21.9 million facility will be capable of combating severe flooding events during king tides and the 100-year, 24-hour storm event. In February 2021 the City of Aberdeen selected us for the final design phase of the pump station. Completed on time and under budget in fall of 2024, the pump station is equipped with an increased pumping capacity by more than six times the previous facility, new tide gates to help control water flow and a new fish screening system to protect salmon habitats in the area.