Audubon National Wildlife Refuge Trail is a standout hiking destination in Coleharbor, North Dakota, covering 3.5 miles with 60ft of elevation change. Stats: 3.5 miles, 60ft gain, Easy. Type: Loop. Surface: Gravel. Time: 1-2 hours. Fee: Free. Dogs: Yes. Permit: No. Wildlife: pelicans, ducks, deer, bald eagles. Best seasons: Lake Audubon waterfowl habitat on Lake Sakakawea. Pack water, layers, and appropriate footwear. Conditions vary across North Dakota. Leave No Trace: stay on trail, pack out all waste, respect wildlife.