Near Letts Lake, the Miner Ridge Loop is a technical ride. This route offers a real challenge to experienced mountain bike enthusiasts. The loop consists of low maintenance level dirt roads and portions of three OHV trails designated for two wheeled use only. The trail portions constitute a total of 2.3 miles and include some single track opportunities. This route offers a variety of challenges in a conifer/oak forest including tight corridors through the trees, steep gradients with rocks, ruts, rolling dips and even a low water stream crossing of Miner Creek. The route offers scenic views of Snow Mountain and St. John Mountain and overlooks the deep rugged Mill Creek Canyon to the south. The route is fairly well marked using portions of OHV trail 13, 14, and 15 to compliment the road portions. Bike riders must be cautious of dirt bikes using these trails. This is a strenuous day ride, and should only be attempted by expert riders. The route offers equal challenge in either direction. Letts Lake offers camping, picnicking, fishing, swimming, and non motorized boating in season.
To reach the trailhead from Interstate 5 on Maxwell/Sites road to Sites. Continue west on Sites/Ladoga Road to Ladoga Road, to Ladoga. Continue west on Ladoga/Stonyford Road to Stonyford. From Stonyford travel west on the Fouts Springs/Letts Lake Road to Letts Lake Campground. This are can also be accessed from Interstate 5 at Willows. Travel west on State Highway 162 to Elk Creek then south on Country Road 306 to Stonyford.
Overall, Miner Ridge Loop Trail is the 53rd most popular mountain bike trail of all 132 mountain biking rides in California.