Drivers can expect two weeks of traffic restrictions starting Monday, July 15, on Highway 9, south of Wickersham near the Skagit County line.
One lane will be closed and flaggers will direct traffic starting Monday morning and ending at 8 p.m. Friday, July 19, between Royer Street and NP Road.
That stretch of highway will close from the evening of July 19 to 5 a.m. Monday, July 22, so a culvert over NP Creek can be replaced.
Signs posted during the closure will direct drivers to alternate routes.
Traffic will be reduced to one lane again the week of July 22. Work on the $351,486 project should be completed by the end of July.
The new culvert will provide access to a mile of salmon and trout habitat upstream of the highway, a Department of Transportation statement said.