Boating, Canoeing and Kayaking - Mammoth Cave National Park (U.S. National Park Service) Operating a jet ski or any other 1- to 2-person motorized watercraft with a total length of 8 ft. or less is prohibited upon all navigable waters of the park. The use of this type watercraft on navigable park waters is hazardous due to submerged obstructions within river channels. The noise created by use of these types of watercraft is also incompatible with other park uses.
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