Breakneck Pond Trail is a standout hiking destination in Union, Connecticut, covering 4.5 miles with 300ft of elevation change. Stats: 4.5 miles, 300ft gain, Moderate. Type: Loop. Surface: Dirt. Time: 2 hours. Fee: Free. Dogs: Yes. Permit: No. Wildlife: deer, black bears, moose, beavers. Best seasons: Pond and forest trail in Bigelow Hollow State Park. Pack water, layers, and appropriate footwear. Conditions vary across Connecticut. Leave No Trace: stay on trail, pack out all waste, respect wildlife.