Project Info

SR 106 - Twanoh Falls Improvements - Complete October 2014

The Twanoh Falls improvement project on State Route 106 replaced a culvert to improve creek flow, allow for fish passage and reduce sediment buildup.


How you benefit

Improves safety
The larger culvert and raised highway allows water to flow freely without sediment build up and flooding to the roadway. This will save money on frequent maintenance costs.

Protects environment
Salmon and other fish need access to freshwater habitat for spawning and juvenile rearing. WSDOT recognizes that removing fish barriers is important to the restoration of fish habitat and salmon recovery efforts.

Since 1991, WSDOT has completed hundreds of fish barrier removal projects opening up over 1,000 miles of potential upstream habitat for fish.

Visit our Fish Passage project website for an interactive map of all barrier locations and project details.

Partnerships & cooperation
This project was part of the Chronic Environmental Deficiency (CED) program. As part of an agreement with Washington Department of Fish and Wildlife, WSDOT is moving away from the repetitive repair of roadways that require recent, frequent and chronic maintenance repairs. Instead, WSDOT concentrates on long-term solutions that will optimize the improvements for fish and fish habitat, while also addressing transportation needs. 

View the 2008 Twanoh Falls Creek Site and Reach Assessment (pdf 3.4 mb)

Contact us
Michele Britton
Project Engineer

Claudia Bingham Baker
Olympic Region Communication Manager

Twanoh Falls construction map
Click for full size map

The Twanoh Falls improvement project, located on State Route 106, replaced a culvert to improve creek flow, allowing for fish passage and reducing sediment buildup. This project replaced a culvert to improve creek flow, allow for fish passage and reduce sediment buildup.