On Butler Lake Road, 1.5 miles east of Long Lake recreation area, the Butler Lake Loop Trail in the Kettle Moraine State Forest-Northern Unit winds more than three miles through the 158-acre Butler Lake and Flynn's Spring State Natural Area. A portion of the loop trail is shared with the Ice Age Trail. Interpretive displays are set at the base of the esker and overlook Butler Lake. A picnic table, grill, and drinking water are at the trail head. Trail usage includes hiking and snowshoeing.