If riding on lower Woods Creek Rd. Check the County Project page - http://www1.co.snohomish.wa.us/Departments/Public_Works/Services/Roads/Projects/WoodsCrkCulvert.htm
Detour and timeline for the work.
http://www.co.snohomish.wa.us/documents/Departments/Public_Works/Roads/Projects/WoodsCrkDetour-lrgweb.pdf