State Route 20 Closed in Nevada County


California State Route 20

District: District 3 - Marysville
Amarjeet S. Benipal, District Director                        
Contact: Jeremy Linder
Phone: (530) 701-5209


NEVADA COUNTY – Caltrans is reminding motorists that State Route 20 (SR-20) is now closed 17 miles east of Nevada City in Nevada County, as construction work continues on the Omega Curves Project.

The Lowell Hill segment is scheduled to be closed, between the Omega Overlook and Bear Valley through Sunday, October 1 at 7 p.m

Motorists traveling between Nevada City and Interstate 80 will use State Route-49 (SR-49) and State Route -174 as alternate routes. Large trucks are directed to only use SR-49.

Construction crews are grading and paving the road, constructing tie-in locations to divert the traveling public from the current roadway to the new alignment. So far there has been no signification delays and work is currently on schedule.


image of two lane road

During the closure the California Highway Patrol will be on site, with access for emergency vehicles only. In the event of an emergency CHP will communicate with crews on sight and take appropriate action.

image of roadwork   image of moving dirt

Once work is complete the closure will move 6 miles west to the White Cloud segment, between the White Cloud U.S. Forest Service and Campground and Washington Road, Sunday, October 1 at 7 p.m. to Friday, October 6 at noon.

The schedule is subject to change or be delayed due to weather, availability of materials or other unexpected events.


map of route 20


The work is part of the $54.6 million Omega Curves Project, which will improve safety and reduce collisions on SR-20 by realigning curves on two non-continuous 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 CHP. 

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

Caltrans District 3 is responsible for maintaining and operating 4,385 lane miles in 11 Sacramento Valley and Northern Sierra counties. Caltrans reminds motorists to “Be Work Zone Alert” and slow in construction zones for the safety of travelers and crews performing these improvements. 

The department will issue construction updates on @CaltransDist3 and on Facebook CaltransDistrict3. For real-time traffic, click on Caltrans’ QuickMap or download the QuickMap app from the App Store or Google Play.

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