Mansfield Hollow State Park Trail is a standout hiking destination in Mansfield, Connecticut, covering 5.5 miles with 200ft of elevation change. Stats: 5.5 miles, 200ft gain, Easy. Type: Loop. Surface: Dirt. Time: 2-3 hours. Fee: Free. Dogs: Yes. Permit: No. Wildlife: deer, herons, beavers, painted turtles. Best seasons: Flood control reservoir with excellent water bird viewing. Pack water, layers, and appropriate footwear. Conditions vary across Connecticut. Leave No Trace: stay on trail, pack out all waste, respect wildlife.