Surrounded by the grasslands of post rock country, this clear lake provides a variety of recreational opportunities. The two-and-a-half-mile hiking loop at the Rocktown Natural Area features diverse prairie grasses, plants, and Dakota sandstone formations in a secluded cove. As the Conard Kansas Trail Guide states, the 21-mile Switchgrass Trail is a Kansas mountain biker's dream. Shorter trails are also worthy of your time. The dam and lake became operational in 1965 as a flood control measure. State park entrance charge. Cabins available, reservations required.