Mammoth Furnace Ramp is a seasonal boat access point on Lake Barkley in Lyon County, Kentucky, featuring a single unpaved launch lane suitable for light trailerable recreational boats.

The facility offers limited capacity (25 or fewer vehicles) with unpaved parking and is free to use, though amenities are minimal with no restrooms, docks, or handicap facilities available.

The ramp and shoreline are open 24 hours during the season, making it a basic access option for anglers and paddlers.