Jack Hammer is part of the famous "Hammers" in Johnson Valley and is known as possibly one of the most challenging off-roading routes in the world. Jack Hammer is extreme and anyone who attempts it should be fully aware that damage is inevitable and part of the experience. Huge boulders, tall ledges, and tight spots that require scraping on the sides are all part of the adventure. Only the most experienced drivers operating well-built, highly modified machines with roll cages should attempt. Be prepared with recovery gear, spare parts, and other vehicles (no not attempt alone). Despite the short length of the route, be prepared to spend most of the day making your way through.