The trail begins on the north side of the recreation area parking lot at Grasshopper Point. The trailhead sign is 75 feet further along the trail. The trail is near level and mostly in full shade from remnants of an old orchard and various native riparian trees. It follows along the foot of a rock wall on the left, a short distance from Oak Creek which can be heard but is seldom in sight. Several short paths provide access to this scenic creek for fishing, swimming, and picnicking. Be careful of poison ivy. The trail ends at the Casner Canyon Trailhead. Return by the same route for a pleasant 1 mile hike. The trail is probably named for Charles R. Allen, a photographer who homesteaded at the location of the present Junipine Cabins further upstream.