The Nevada County Airport is at 12818 Loma Rica Drive. That's about a half-mile up Loma Rica from its intersection with Brunswick Road.
Visit the Airport Website
HERE .
The County Equipment Yard and Receiving are adjacent to the Airport.
(By the way, the nearest airport for commercial passenger flights is
Sacramento International Airport, about an hour southwest of Grass Valley.
Reno-Tahoe International Airport is about two hours east of Grass Valley and is the nearest major airport to Truckee.)