Northwest of Yuba City and west of Stonyford in the Mendocino National Forest, the Davis Flat area (aka Stonyford OHV) has 200 miles of dirt bike routes ranging from 1,700 feet to 6,000 feet in elevation.
To reach the dirt biking trailhead for Davis Flat from US5, use Exit 585. Head west on Maxwell Sites Road. Veer right on Sites Lodoga Road and veer right on Lodoga Stonyford Road to Stonyford. Turn left on Fouts Spring Road (SR43A) for 7 miles. Turn right on Old Fouts Spring Road to the Davis Flat / Fouts Springs OHV Staging Area.
Overall, Davis Flat ORV is the 45th most popular dirt bike trail of all 120 dirt biking rides in California.