NEVADA COUNTY – Caltrans is alerting State Route 20 (SR-20) motorists in Nevada County to expect one-way traffic control during weekdays and occasional Saturdays for major roadway construction work.

Motorists should expect delays of up to 20 minutes between 6 a.m. and 6 p.m. weekdays at multiple locations along a 14-mile stretch of highway between Conservation Road and Lowell Hill. Crews may also intermittently work between 6 a.m. and 6 p.m. on Saturdays, with one-way traffic control in effect. Construction crews are installing or rehabilitating drainage, performing earth work to widen sections of the roadway and preparing for major dirt fill work to begin.

Omega curves on Hwy 20
Omega curves on Hwy 20

Motorists are advised to expect travel delays on SR-20 through the summer and fall months while these major improvements are under way. The schedule is subject to change due to weather, equipment or material availability, or other unexpected events.

The work is part of the $62.5 million Omega Curves project (see map), which will improve safety and reduce collisions on SR-20 by realigning curves on two non-contiguous segments near White Cloud and Lowell Hill, widening shoulders, improving the highway’s sight distance and adding designated left-turn lanes near Conservation Road and Washington Road. In addition, three turnouts will be added where slow-moving vehicles can allow motorists to safely pass, while also serving as traffic-enforcement locations for the California Highway Patrol.

Granite Construction, Inc. of Sacramento is the prime contractor for the Omega Curves safety project, which is expected to be completed in fall 2023. For project updates, please visit