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Cottonwood Slough-Dry Run
Cottonwood Slough-Dry Run is a glaciated finger outlet of the world's largest Pleistocene glacial lake. The site contains a completely undisturbed wetland complex including potholes, streams, shallow open water, lakes, and marsh.
Location: Roberts County, SD
Year designated: 1975
Ownership: State, Private
Please remember, National Natural Landmarks (NNLs) are not national parks. NNL status does not indicate public ownership, and many sites are not open for visitation.
Last Updated: June 28, 2012