Construction begins Monday on Highway 299W in Shasta and Trinity counties.
Crews will be starting roadwork on the stretch of 299 between Redding and Weaverville.
The construction around Buckhorn Summit is expected to cause delays of up to an hour. Work will run between 6 a.m. and 6 p.m.
The projects around Buckhorn Summit are expected to last through fall.
For updated traffic information call the Caltrans Buckhorn Summit Construction Hotline at 530-225-3452.