Today’s hike was on mountain bike trails overlooking the Colorado River.   The 11 mile loop climbed to the top of Amasa Back with the river on both sides far below.   Much of the trail was on sandstone slickrock with a variety of arches, fins, pillars, buttes, alcoves, ramps, potholes, strata, and gargoyles along the way.   This was a double black diamond rugged trail for bikers, but just right for steady hikers.