Weldon Springs Glacial Lake Trail is a standout hiking destination in Clinton, IL, covering 4.0 miles with 100ft of elevation change. Stats: 4.0 miles, 100ft gain, Easy. Type: Loop. Surface: Dirt. Time: 2 hours. Fee: Free. Dogs: Yes, on leash. Permit: No. Wildlife: deer, herons, eagles. Best seasons: Glacial lake in central Illinois. Pack water, layers, and appropriate footwear. Conditions vary across IL. Leave No Trace: stay on trail, pack out all waste, respect wildlife.