Caltrans this week is planning road projects in Lake and Mendocino counties that likely will affect traffic:

–Highway 1, storm damage repairs near Union Landing viaduct in Mendocino County, 6 a.m. to 5 p.m. weekdays. Perhaps 5-minute delays with one-way traffic control.

–Highway 20, highway widening from 2.3 miles to 3.3 miles east of Gravel Pit Road in Mnedocino County, 7 a.m. to 4 p.m. weekdays. Perhaps 5-minute delays with one-way traffic control.

–Highway 20, routine maintenance from Daws Avenue to just east of Lakeshore Drive in Lake County, 8 a.m. to 4 p.m. weekdays, starting Tuesday. Perhaps 10-minute delays with one-way traffic controls.

–Highway 20, slide repairs west of Gravel Plant Road in Lake County, 7 a.m. to 4 p.m. weekdays. Perhaps 5-minute delays with one-way traffic controls.

–Highway 29, guardrail repair at various spots between Lakeport Boulevard and Martin Street in Lake County, 7 a.m. to 5 p.m. weekdays.

–Highway 101, pavement repair from Robinson Creek Bridge to Uva Drive in Mendocino County. One-way traffic control from 8 p.m. Sunday through 3 p.m. Friday. Northbound ramps at Calpella and Highway 50 and southbound ramp at Highway 20 will be closed intermittently.

–Highway 101, paving at North State Street interchange in Ukiah, 5 a.m. to 5 p.m. Thursday. Traffic will be restricted to one lane. Northbound onramp will be closed.

–Highway 175, guardrail repair just east of Lake-Mendocino county line, 7 a.m. to 5 p.m. Monday. Perhaps 5-minute delays with one-way traffic controls.