"Calamity Canyon" is rated a 3+. This trail is in a beautiful narrow-walled canyon for most of its length. The trail crosses Bear Butte Creek numerous times. A major obstacle on the trail is the Boulder Highway,  a 200-yard stretch of large, jumbled rocks. After a leisurely lunch, you work over several minor obstacles and then come fact-to-face with Viper Rock. The rock is so named, not because of the snakes in the area, but due to the shape of the large flat off-camber rock you have to negotiate. It's then off to the highway, back through Deadwood or Galena, and then down to the campground. Note: There is an optional 4+ obstacle called "The Bump" that is available to locked vehicles if time permits; check with the trail leaders.