The cave is a short distance past Moonshiner's Arch along the bank of the river. It is on the boundary and may actually be on private land so I won't give out directions. I'm sure it can be searched. The mouth at the river is about 15 feet wide x 6 feet high. Inside it gets narrow and splits. If you stay to the right you can go all the way thru. You have to scramble a little and at the end there are 3 exits. Its only maybe 100yds long.
The area itself is popular with repellers.