Stone State Park Loess Bluff is a standout hiking destination in Sioux City, IA, covering 9.0 miles with 700ft of elevation change. Stats: 9.0 miles, 700ft gain, Moderate. Type: Loop. Surface: Rocky. Time: 4 hours. Fee: Free. Dogs: Yes, on leash. Permit: No. Wildlife: deer, coyotes, turkeys. Best seasons: Loess Hills bluffs above Sioux City. Pack water, layers, and appropriate footwear. Conditions vary across IA. Leave No Trace: stay on trail, pack out all waste, respect wildlife.