The California Department of Transportation (Caltrans) has scheduled a full highway closure of State Route 121 (SR-121) between Vichy Avenue and Wooden Valley Road in rural Napa County to install rockfall prevention netting, agency officials announced.

The netting will be installed on a hillside above SR-121 just south of Wooden Valley Road.

To ensure worker and public safety, SR-121 between Vichy Avenue and Wooden Valley Road will be closed 7 a.m. until 5 p.m. Saturday, Oct. 20 and Sunday Oct. 21, they said.

Northbound SR-121 Detours From Napa to Lake Berryessa

Motorists on northbound SR-121 will be detoured starting at the intersection of Trancas Street and Monticello Road, then onto northbound SR-29, then eastbound SR-128, then re-enter northbound SR-121 from eastbound SR-128. Detour signs will be posted.

Southbound SR-121 Detours From Lake Berryessa to Napa

Motorists on southbound SR-121 will be detoured starting at Wooden Valley Road and detoured onto northbound SR-121, then westbound SR-128, then southbound SR-29 and re-enter southbound SR-121 from southbound SR-29.

SR-121 Local Access Only for Residents, Businesses and Visitors to Businesses

Local residents, businesses and visitors to businesses north of 3560 Monticello Road may access their property at the closure at Wooden Valley and SR-121.

Local residents, businesses and visitors to businesses south of Kenzo Estate/Wild Horse Valley Road may access through the closure at Vichy Avenue and SR-121.

Motorists will NOT be allowed between the Kenzo Estate/Wild Horse Valley Road and 3560 Monticello Road. Motorists should expect delays and allow for extra travel time. CHP will help direct motorists. All work is weather permitting.