• The Historic Entrance of Mammoth Cave

    Mammoth Cave

    National Park Kentucky

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  • Alert - Mammoth Cave is in an area highly endemic to histoplasmosis

    Histoplasmosis is a serious infection caused by breathing in spores of a fungus often found in bird and bat droppings. Infants and immunocompromised persons are especially vulnerable. Click the link for more information. More »

Rivers and Streams

Nature and Science

Green River

The Green and Nolin Rivers possess one of the most diverse fish (82 species) and invertebrate faunas (51 species of mussels) in North America. In addition to the mussels, there are approximately 200 species of benthic macroinvertebrates in these rivers. For these biological reasons, the Green River has been designated an "Outstanding Resource Water". As explained above, since Green River is the base-level stream for the Mammoth Cave System, it has crucial influence on the cave aquatic community since food supply and sediment transport are both affected. Normal flow of 16 miles of the Green River, 7 miles of the Nolin River, and many miles of cave streams in the park is retarded by a relict dam known as Lock and Dam #6. Habitats for 7 federally listed endangered aquatic species are seriously degraded through reduction of natural flow velocity and resultant siltation. The quality of recreational non-motorized boating is also seriously diminished by the 21 miles of pooled river within the park.

Did You Know?

Did You Know? - Mammoth Cave National Park has more than 70 miles of backcountry trails.

Mammoth Cave National Park contains more than 70 miles of backcountry trails through forested Kentucky hills for hikers, horseback riders, and bicyclists. Several frontcountry trails lead to special places like Cedar Sink, Sand Cave, and Turnhole Bend.