Larch Way Culvert Replacement


On Larch Way, between 28th Avenue W and Cypress Way, a pipe arch culvert under the road is deteriorating. This pipe is undersized and a partial barrier to fish. Due to the deterioration of the culvert and the fish impassability, the culvert will be replaced in the summer of 2018. A detour will be needed to complete this project.

For this project the undersized pipe will be replaced with an aluminum structural plate pipe arch. The culvert will measure 53 feet in length and provide an opening that is 8.4 feet high and 14 feet wide.


Estimated cost for this culvert replacements is $275,000 and will be funded by the Snohomish County Public Works Surface Water Management Urban Growth Area revenues.


Work is anticipated to begin between July 2018 and conclude in late September 2018

Traffic Impact

To install the new culvert, Larch Way will be under construction from late July through August  
  • The expected road closure dates are from 7/30/18 - 8/10/18
  • The detour route will be signed and utilize 28th Ave W, 204th Street SW, Cypress Way


  • Postcard May 2018