Johnsons Shut-Ins Rock Gorge is a standout hiking destination in Middle Brook, MO, covering 2.5 miles with 300ft of elevation change. Stats: 2.5 miles, 300ft gain, Moderate. Type: Loop. Surface: Rocky. Time: 1.5 hours. Fee: $5/vehicle. Dogs: Yes, on leash. Permit: No. Wildlife: deer, herons, otters. Best seasons: Igneous rock gorge with natural water slides. Pack water, layers, and appropriate footwear. Conditions vary across MO. Leave No Trace: stay on trail, pack out all waste, respect wildlife.