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

Project news

  • A one-lane detour is in place controlled by a temporary signal around-the-clock through late fall. 
  • View construction progress photo album.
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Needs & benefits

Why is WSDOT removing barriers to fish on Olsen Creek?

Correcting fish passage barriers is an important part of the state's efforts to protect and restore fish runs negatively affected by outdated culverts under state highways. The existing culvert has been identified as a barrier to fish. Installing a larger box culvert will allow the creek to flow more naturally under the highway and improve fish habitat for the area. This fish passage project is one of about 1,000 culverts across the state that are mandated to be replaced. In 2013, the U.S. District Court for Western Washington ruled that the state must remove culverts that block fish passage under state highways. 


WSDOT will remove two small culverts under State Route 112 near Olsen Creek and replace them with a 55 foot pre-stressed concrete girder bridge intended to improve fish habitat. Now that the one lane detour has been built, drivers will encounter an around-the-clock traffic shift controlled by a temporary signal through late fall. The realigned lane will give crews enough room to build the bridge and keep traffic moving. All work will take place during the daytime hours each Monday through Saturday to allow the contractor to meet the project's deadline. 

Drivers are encouraged to expect delays, a reduced speed limit and occasional roadway closures of up to 15 minutes.

The End Result

Olsen Creek will be restored to a more natural, free-flowing state resulting in improved fish passage for local migratory fish. This will bring the stream crossing into compliance with the U.S. District Court ruling. The potential habitat gain for this project is nearly two miles.


  • 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 Data for PIN 311247A
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $3,503
CWA $0
Total $3,503


WSDOT Construction Project Engineer
Jerry Moore

WSDOT Communications
Tina Werner

Olsen Creek project map thumbnail

Existing SR 112 culvert