Snohomish County Surface Water Management (SWM), a division of the Department of Conservation and Natural Resources, is scheduled to replace six failing culverts near the intersection of 67th Ave NE and 112th St NE during summer of 2024.
These culverts are deteriorated and under-sized, causing private property flooding during storm events. The culverts, consisting of five driveway culverts and a road culvert, convey North Fork Allen Creek and Little Coho Creek which are fish bearing streams.
The project will replace the six culverts with larger, fish passable structures. North Fork Allen Creek and Little Coho Creek will be realigned for the entire distance of the project, approximately 1700 lineal feet, to accommodate safety improvements -- including shoulder widening and adding guardrail. Both streams will be enhanced with habitat features.
Construction is currently planned for summer 2024.
Construction will require a full road closure and detour for the duration of the project, but local access for property owners within the closure limits will be maintained during that time. Road closure is expected to start July 1st and end in the fall. This website will be updated with more information when the start date for the road closure and detour route have been identified.
The project will be paid for using Snohomish County Surface Water Management (SWM) and Road Funds. Total estimated cost for the project is $3.5 million.
Construction schedules are subject to change based on many factors that include: public safety; availability of funding, staffing, equipment and materials; right of way issues; permitting requirements; coordination with utilities and other agencies; soil conditions under roadway and seasonal changes.