Southwest of Granby in the Arapaho National Forest, the Williams Fork Trail System has over 40 miles of routes open to ATV 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. Out-of-state residents who bring OHVs into Colorado must purchase a Colorado Non-Resident OHV permit which is valid from the date of purchase through the following March 31. These permits can be purchased anywhere you get your hunting/fishing licenses in Colorado. 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.
Note: As of September 2007, ATV riding on Forest Service roads is only permited on roads marked as open to ATV. All ATVs must be registered.
Overall, Williams Fork Trail System is the 35th most popular ATV riding trail of all 90 ATV trails in Colorado.