Stuart Peak is a 18 mile out and back trail located near Missoula, Montana that features a river and is only recommended for very experienced outdoorsmen. The trail is primarily used for hiking & mountain biking and is accessible from June until September. Dogs and horses are also able to use this trail.
The Stuart Peak Trail will take you all the way to the Rattlesnake Wilderness, which is the turn around point for mountain bikers since bikes are not allowed past this point. The climb is long and strenuous, but mountain bikers will enjoy the downhill on the way back. It's worth noting that this trail does not offer much scenery, but what it lacks in scenery, it definitely makes up with the fun factor.
From Missoula, at the junction of Van Buren Street and Interstate 90, take Van Buren north (Rattlesnake Dr.) about four miles north to the Rattlesnake National Recreation Area trailhead. Turn left off Sawmill Gulch Road to get to the ample parking area. Information board with maps and restrooms are available.
Plenty of trailhead parking, toilets and free trail maps. No water.