Swanson Reservoir Trail is a standout hiking destination in Trenton, Nebraska, covering 5.0 miles with 80ft of elevation change. Stats: 5.0 miles, 80ft gain, Easy. Type: Loop. Surface: Dirt. Time: 2-3 hours. Fee: $6 park fee. Dogs: Yes. Permit: No. Wildlife: pelicans, herons, deer, pronghorn. Best seasons: Southwest Nebraska reservoir with excellent water bird viewing. Pack water, layers, and appropriate footwear. Conditions vary across Nebraska. Leave No Trace: stay on trail, pack out all waste, respect wildlife.