The Church Rocks Loop is a popular trail just north of Washington (about 10 miles north of St. George). The loop itself is 3.1 miles of 80% slickrock.
These two trails were added to the Hurricane Cliffs trail system in 2014. Neither is a stand-alone trail, as you must combine other trails to create a ride. From either end, you'll need to do a portion of JEM to reach them.