Other than having to run under the creek, you could run air line that distance with no problem if you can put the electric compressor where there is electric now. If you do decide to go that route, I'd trench in the air line, encasing it in a larger dia PVC pipe that started on one side of the creek,went somewhat under the creek bed, and ended on the other side of the creek. Once the PVC is under the creek, it wouldn't be hard to fish the airline thru the PVC pipe. (2"-3" dia for ease of fishing thru)
