The area is characterized by steep mountainous terrain that has U-shaped glacial valleys as well as steep river drainages. The landforms are extremely complex due to the headwaters of numerous major drainages that occur within the area such as Crooked River, Ten Mile Creek, Bear River, and the North and Middle Forks of the Boise River. Use of the area is primarily backcountry hiking, horseback riding, and big game hunting. Motorized and non-motorized use occurs on an extensive network of 14 different trails totaling 77 miles.
Some trails are for non-motorized use only, while others are popular for backcountry motorcycle use.
The extensive stream system and drainages are known to have populations of bull trout, redband rainbow trout, cutthroat trout, and brook trout. Many of the streams provide high quality spawning and rearing habitat and are important for the viability and persistence of threatened and endangered species. A wide variety of wildlife occurs in the area, from small animals to larger mammals. Moose occur in the upper reaches of North Fork Boise River, and gray wolves have been spotted in the area. Bald eagles winter along the North Fork Boise River, and numerous species of mountain songbirds inhabit the area.