Southeast of Missoula and Lolo in the Bitterroot National Forest, the 70 mile Easthouse National Recreation Trail (Bitterroot Rock Creek Divide Trail #313) is open to horseback riding and follows the Skalkaho Mountain divide north from Skalkaho Pass that is open to horseback riding.
The northern trail access is at Sawmill Saddle located southeast of Stevensville. From here, the trail runs south along the crest of the Sapphire Mountains for 70 miles until ending at the Continental Divide Trail about 1 mile south of Hidden Lake inside of the Anaconda Pintlar Wilderness Area. Most of the route is between 7,000 and 8,000 feet in elevation which offers up amazing vistas of the Bitterroot and Pintlar Mountains. Along the route, you will want to watch for brown bear, mountain lions and wolves.
There are two forks along this trail. One fork of the trail joins the Palisade Trail. The other fork follows the divide north along the Skalkaho Game Preserve.
Overall, Easthouse National Recreation Trail is the 4th most popular horse trail of all 16 horseback rides in Montana.