The East Fork of the San Gabriel River, Prairie Fork and Upper Lytle Creek drain the area. Chaparral covers the lower slopes, changing to a mountain forest of mixed southern California evergreens. A rich diversity of wildlife includes Nelson bighorn sheep, deer, coyotes, bears and mountain lions. Several inholdings of privately owned land occur within the Wilderness borders and deserve special consideration. The Pacific Crest Trail skirts the northern boundary crossing Mount Baden-Powell at 9,399 feet.
Several trails lead into the interior.
Mine Gulch Trail enters from the north to join the East Fork Trail to cross the entire Wilderness from north to south, roughly 13 miles total. From there the Mine Gulch Trail heads south into the Wilderness. Accessible year-round, but summers are hot. A free visitors permit is required. A California Campfire Permit is required even if you only intend to cook on a backpacking stove.