Lower & Upper Rock Basin

The Rock River Stormwater Group is responsible for stormwater education and outreach in the Lower and Upper Rock Basins. The Rock River Stormwater Group is the organization behind the Protect Wisconsin Waterways brand. Learn more about the municipalities that make up the Rock River Stormwater Group.

Lower Rock

The Lower Rock basin is located in south central Wisconsin. It encompasses Dane, Rock, and Columbia counties.It includes the Rock River, Koshkonong Creek, Yahara River, Lake Mendota, and Lake Monona.  This basin faces water quality impacts and increased runoff quantity, loss of agricultural lands, loss of habitats, lower urban groundwater levels, and significant groundwater contamination.

Upper Rock

The Upper Rock basin is located in east central Wisconsin. It includes Marquette, Adams, Calumet, Columbia, Fond du Lac, Green Lake, Winnebago, and Waushara Counties. The Upper Rock River Basin is 2,092 square miles. Some of the watersheds in this basin include the Beaver Dam River, the Rock River, the Sinissippi River, and Oconomowoc River.

Rock River Basin Waterways

Whitewater Lake

Cravath Lake & Tripp Lake


Photography by Danny Balister