Phone: (530) 265-3202 • Fax: (530) 265-3260
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Nevada City, CA 95959
Current Projects
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For reports relating to current projects, please visit the Reports section of the website.
  See descriptions of current projects below.
Nevada County
SR 49 Widening at LaBarr Meadows - Project Completed in 2013

The State Route (SR) 49/La Barr Meadows Road Project will relocate the existing La Barr Meadows Road intersection at SR 49 just south of the current location and install a traffic signal. The project will also widen the highway from two to four lanes to the north and south of the new intersection with turn pockets to provide adequate vehicle storage and left turn movements at the signal. Frontage roads will be constructed to eliminate direct access to the highway from side roads and driveways. Vehicles will access SR 49 from the new signal. The design features will relieve existing congestion and eliminate ingress and egress conditions that have contributed to a high rate of accidents within the project area. The project limits begin 0.7 miles north of Alta Sierra Drive and extends to 0.5 miles south of Wellswood Way.

The total project cost is estimated at $29.1 million; approximately $20.9 million is programmed through the State Transportation Improvement Program (STIP), $2 million through ARRA (American Recovery and Reinvestment Act) funds, and $6.2 million is being provided from the Corridor Mobility Improvement Account (CMIA), utilizing funds approved by the passage of Proposition 1B. Design and right-of-way for the project were completed in April 2009. The project is scheduled for completion by the end of July 2013.

Click here to view an overview of the SR 49/La Barr Meadows Widening Project

Caltrans Drawing of the SR 49/La Barr Meadows Road Project
(large file ... please be patient as it loads)
Nevada City
No projects at this time
Grass Valley
Dorsey Drive Interchange

Construction of the Dorsey Drive Interchange started on May 6, 2013 and is scheduled through fall 2014.  The City of Grass Valley is the lead agency working in partnership with the Nevada County Transportation Commission and Caltrans.  Construction information will be posted on a special website at  You can sign up on the website to receive electronic notices of traffic alerts and project updates.  A project information hotline is also available at (530) 268-4573.  Construction will generally take place Monday through Friday from 7:00 a.m. to 5:00 p.m.  The contractor, McGuire and Hester of Oakland, may also work at night on occasion.  The bid for construction was approved at $15,191,874.

The Dorsey Drive Interchange project will convert the existing overcrossing of SR 20/49 to an interchange that allows access to the Golden Center Freeway in Grass Valley. The purpose of the project is to provide improved access to high-use sites in the area, including the Nevada County Sierra College Campus and Sierra Nevada Memorial Hospital. The interchange will also improve traffic operations at the adjacent Brunswick Road and Idaho-Maryland Road interchanges and provide additional capacity on Dorsey Drive for future planned development, in accordance with the General Plans of Grass Valley and Nevada County.  Project components include: 

  • Widen the Dorsey Drive overcrossing from two to five lanes with two of those lanes designated for left turns
  • Construction of on- and off-ramps to SR 20/49 
  • Addition of auxiliary lanes on SR 20/49 freeway from Dorsey Drive south to the Idaho-Maryland Road exit and north to the Brunswick Road interchange
  • Widening of Dorsey Drive to East Main Street and to Pampas Drive with enhancements for pedestrians and bicyclists
  • Modify a portion of Joerschke Drive to a one-direction off-ramp for southbound SR 20/49 traffic

July 2014 Newsletter - Dorsey Drive Interchange Project
July 2014 Grass Valley Staff Update of the Dorsey Drive Interchange Project

Click links for 3 aerial views of the Dorsey Drive Interchange project:
The most recent estimated project cost is $25.4 million with construction equaling $15.7 million, right-of-way costs of $4.3 million, and project environmental, design, and support costs of $6.6 million.    
SR 89 Mousehole Truckee

SR 89 is a major artery for vehicles traveling from I-80 to Lake Tahoe and several major recreation facilities in the area. The current Union Pacific Railroad underpass structure on SR 89 in Truckee, known locally as the "Mousehole," has long been the subject of discussion regarding its inadequacies. The structure was completed in 1928 by the U.S. Bureau of Public Roads. It has become a focal point for traffic congestion and needs improvements to provide safe pedestrian and bicycle access. Pedestrians who use the route to access shopping nearby have been observed running through the Mousehole to avoid conflict with cars. Others climb up and over the 25-foot-high railroad embankment rather than risk walking through the underpass. 

Pedestrian walking through Mousehole

The Town of Truckee, Caltrans, and the Nevada County Transportation Commission are providing funding to develop a project to improve traffic flow and safety at the Mousehole. Caltrans has assembled a Project Development Team for this project, and after looking at several alternatives, it has been determined that due to the high cost of widening the existing tunnel or adding a new tunnel, the scope of work is now focused on constructing a 10-foot-wide Pedestrian/Bicycle Undercrossing Tunnel on the east side of SR 89 between West River Street and Deerfield Drive. A 12-foot-wide by 10-foot-high concrete tunnel for pedestrian and bicycle use is planned to be constructed beneath the Union Pacific Railroad tracks east of the existing vehicle tunnel.  In order to construct the project, Caltrans will provide $4.4 million from the State Highway Operation and Protection Program and $570,000 of toll credits to be used for federal matching purposes; NCTC has programmed $1.3 million of Regional Improvement Program funds and Truckee will provide $350,000 from its traffic impact fee fund.  Based on current estimates, project construction is underfunded by $1.5 million and Truckee is submitting an application for a federal grant from the TIGER 2013 program in that amount.

Click here to view Mousehole Alternative 1 (
the pedestrian/bicycle tunnel alternative)

May 2014 Update on the Mousehole Pedestrian Tunnel Project
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