The Mill Pond is a 202 acre impoundment created in the 19th century by construction of a dam for a grist mill. The lake is fed primarily by Blue Spring, a first magnitude spring, and a number of smaller springs. The limestone karst formations beneath the lake create a honeycomb of underwater caves, some of which extend for several miles, and the lake is a popular destination for cave divers from across the country. Water clarity in the pond is extraordinary due to the underwater springs. There is a private campground (Arrowhead Resort) located off highway 90 near the dam. There is also an 18-hole golf course very near the lake.