On County Highway U, one quarter mile west of County Highway A, the Parnell Tower Trail located in the Kettle Moraine State Forest-Northern Unit begins its 3.5-mile loop with a series of steps leading to the highest point of elevation in the forest. There, a 60-foot observation tower rises above the treetops for a birds-eye view of the glacial landscape. The trail follows the Ice Age Trail near a rustic backpack shelter reservable for camping. Picnic tables, grills, drinking water, and vault toilets are adjacent to the trail head. Trail usage includes hiking and snowshoeing.