National Natural Landmarks

Cottonwood Slough-Dry Run

Cottonwood Slough-Dry Run
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

Acres: 6,424

Ownership: State, Private




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Please remember, National Natural Landmarks (NNLs) are not national parks. NNLs are owned by a variety of public and private entities and allowing visitation is at their discretion. Many NNL sites maintain public websites where additional information may be found.

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