Southwest of Granby in the Arapaho National Forest, the Williams Fork Trail System has over 40 miles of routes open to off-road motorcycle trails riding.
To reach the trailhead from Granby, head west on SR40 towards Parshall for 15 miles to CR3. Turn left heading south on CR3. Continue south for 15 miles. There are numerous places to pullout and park, but there is no designated trailhead. There are a mixture forest service roads and old logging roads open to riding in the Keyser Creek basin and Kinney Creek basin. Watch out for extensive on-going logging operations.
There are no known trail maps available for this riding area.
Note: Colorado residents must register their off-highway vehicle with the Colorado State Parks (303) 866-3437. Non-residents are not required to register in Colorado, if they are registered in their home states. All off-highway vehicles must have an approved muffler and spark arrester. These requirements are subject to change so make sure to contact the Colorado State Parks prior to using your off-highway vehicle.
Overall, Williams Fork Trail System is the 18th most popular dirt bike trail of all 93 dirt biking rides in Colorado.