Resurfacing on Highway 21 between Idaho City and Mores Creek Summit is scheduled to begin Monday morning and should be finished by mid-September.
The Idaho Transportation Department says crews will work from 7 a.m. to 7 p.m. Monday through Thursday, and be off the road by noon on Fridays.
A pilot car and flaggers will guide traffic. During that time there will be an intermittent speed limit reduction to 35 miles per hour.