Cold Water Spring State Preserve
The cave system contains a large underground creek that courses around much of the cave's nearly 16 miles (26 km) of passages. The cave system has some unusual features such as its expansion rate, which is higher than most caves. It also has relatively low amounts of oxygen and high amounts of carbon dioxide. In 1987, the Cold Water Cave was designated as a National Natural Landmark by the National Park Service.
There are two entries; both are on private property.
Coldwater Creek Wildlife Management Area is a state hunting ground near Bluffton, and is near to the cave system.
The cave is located in the Driftless Area of Iowa and Minnesota, a region characterized by karst topography, which involves disappearing streams, blind valleys, sinkholes, caves, cold springs, and cold streams, all of which are present here.
Sources
- Cold Water Spring State Preserve Retrieved July 22, 2007
- Karstpreserve.com, retrieved July 22, 2007
- Interview with John Ackerman, July, 2003, retrieved July 22, 2007
References
- ^ "National Natural Landmarks - National Natural Landmarks (U.S. National Park Service)". www.nps.gov. Retrieved 2019-03-21.
Year designated: 1987
External links
- Exploring Iowa's Coldwater Cave Documentary produced by Iowa Public Television