SR 112 - Olsen Creek in Vicinity of Vista Drive - Remove Fish Barrier

Project news

  • Awarded to Interwest Construction, Inc. on March 5, 2018.
  • Construction is scheduled to run early summer through late fall 2018.
  • Crews will remove two 6-foot-diameter concrete pipes located under SR 112 at Strait of Juan de Fuca Hwy and replace them with a new fish-passable structure.
  • Drivers should expect reduced speeds and a one-alternating lane detour around the work site during construction. Road closures of up to 15 minutes may also occasionally occur.

Needs & benefits

Correcting fish passage barriers is an important part of the state’s effort to protect and restore salmon runs. This work is part of WSDOT’s Fish Passage Barrier Removal Program, which identifies and removes barriers to fish passage caused by culverts under state highways.

This project will eliminate a fish barrier under SR 112 and open fish habitat in Olsen Creek upstream from the work. The new culvert will allow the stream to meander in a natural state and the channel through the culvert will be graded to simulate the natural stream bed. The final product will be a new, 55-foot pre-stressed concrete girder bridge for motorists and improved fish habitat in Olsen Creek.

Traffic will be detoured through a temporary, single-alternating-lane route that will be built as part of the project. At the single-lane detour, temporary signals will provide traffic control. In addition, drivers should expect reduced speeds and short roadway closures up to 15 minutes in both directions.


  • March 5, 2018 - Construction contract awarded to Interwest Construction, Inc.
  • June 2018 – Construction begins
  • Late fall 2018 – Project complete and new bridge open to traffic.

Financial Information

Funding for this construction project is paid for through Pre-Existing Funds (PEF) in the amount of $3,392,000.


WSDOT Construction Project Engineer
Jerry Moore

WSDOT Communications
Tina Werner

Olsen Creek project map thumbnail