"Hal Johns" is rated a 5+. Three words describe this trail…rocks, rocks, rocks!! This trail is solid rock crawling from start to finish. This trail has a unique feature...there is an observation trial that runs the entire length of the creek. It can be used as a bypass or for people who just want to watch the fun. To run the rocks, each vehicle must have two lockers (no limited slips), a winch and a minimum tire size of 33 inches. You will most probably take body damage...if you attempt obstacles such as the waterfall and skyscraper...with the extent depending upon driving skill and vehicle combination. Be prepared for extreme rock crawling and some of the best times South Dakota has to offer.  Spotters can be very helpful on this extremely difficult trail.