Downtown Grass Valley Roundabout
The Downtown GV Roundabout is an oblong shaped roundabout proposed to incorporate the complex signalized intersections of the current “Triangle” into a single large intersection; encompassing the legs of S Auburn St, Colfax Ave, Hansen Way, Tinloy St, Neal St and the State Route 20 onramp.
The project is currently navigating the approval and environmental phase, heading into final design towards the end of 2026, with construction expected to occur in summer 2028.
For more information please email: bjornj@grassvalleyca.gov
Roundabout Approval
2020 Intersection Evaluation Report
February 25, 2025 City Council Meeting
November 5, 2025 City Council Meeting
February 24, 2026 City Council Meeting
Roundabout Design
Roundabout Simulation
Click to watch a microsimulation of the final roundabout concept in action. The model simulates existing traffic data during the PM peak traffic hour and adds 10% for future growth, expected to occur in the year 2050 or beyond.
