North of Durango near Purgatory, the Animas River Trail runs along steep river banks through a rocky canyon for nine miles up to the Weminuche Wilderness boundary.
To reach the mountain biking trailhead from Durango, head north on US550 for 28 miles to the NFS Purgatory Campground.
The trail starts on the east side of the road. The route starts by following the Purgatory Trail (#511) east and then southeast down along Cascade Creek to the Animas River (3.7 miles). At the Animas River, turn northeast onto the Animas River Trail (#675) and follow upstream for 5 miles to the Weminuche Wilderness boundary.
Note: This trail should not be confused with the paved Animas River Trail that runs through downtown Durango.
Overall, Animas River Trail is the 86th most popular mountain bike trail of all 175 mountain biking rides in Colorado.