Visit this link at the Idaho Parks and Recreation Website

Pennal Gulch Trail

The Pennal Gulch Trail is an 11.5-mile out-and-back jeep trail ride in the bluffs on the east side of the valley near Challis. Keep your eyes peeled during the ride because you may see bighorn sheep, antelope or deer. To get to the trailhead, travel south of Challis on U.S. 93. Turn north on Spring Road for about 3.3 miles and then follow Friday Spring Road to the parking area and trailhead by the Challis wild horse corrals. The ride starts here. Follow the red highlighted route to the actual trail. The jeep trail is suitable for ATVs, motorbikes and mountain bikes. It runs north along the hills and bluffs climbing more than 800 feet above the Salmon River. The trail is managed by the Challis Field Office of the Bureau of Land Management.