Boating, Canoeing and Kayaking - Mammoth Cave National Park (U.S. National Park Service) Know the water stage. River use is prohibited when river levels are at or exceed 20 feet on the park's water level gauges. Canoe liveries with permits to operate in the park are prohibited from renting or providing canoes during these times. After heavy rains rivers rise and sweep lots of debris from the shoreline. Debris can become a trap or hindrance in water incidents. Debris can be found in three levels: on the surface, suspended in the water and on the bottom. Suspended and bottom debris is usually invisible to you, and therefore is especially dangerous.
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