What you need to know:
Length - 3.8 Miles
Water - Jim Creek right before the pilot knob trailhead is the only water. it should be fairly dependable, but could be dry in a low precipitation year.
Water crossings - the jim Creek crossing is bridged
Camping - Black Hills National Forest Camping rules apply. Setting up your own campsite away from developed fee sites is allowed on most of the Forest for a maximum of 14 days in any 60-day period. However, around developed reservoirs and campgrounds, camping is allowed only in designated areas. General rule: Camp 100 feet away from any road, stream, or trail and 1/2 mile away from developed sites.
Trail condition - pretty easy to follow and in good shape
Notes - the Pilot trailhead has an outhouse. to get to the deer creek trail head you need to take a .3 mile side trail.