A part of the Brookville Lake -Whitewater Memorial State Park Complex, Brookville Reservoir lies in the historic east fork of the Whitewater River Valley. Traces of prehistoric Native American mounds are still found throughout this valley. The area is known by some worldwide for its significant deposit of Ordovician fossils. These 450-million-year-old fossils, reminders of a primeval inland sea, can still be seen. Brookville Lake is home to two State Recreation Areas: Mounds SRA (not to be confused with Mounds State Park in Anderson) and Quakertown SRA. The lake property has more than 25 miles of hiking trails, boating opportunities, and nationally known recreational and sport fishing. Two beaches and more than 400 campsites make this an ideal family vacation spot. The area was purchased by the federal government for flood control and to provide a place for wildlife and recreation. More than 11,000 acres provide a variety of habitats for plants and wildlife. Brookville is one of the few sites in Indiana where walleye grow big enough for fisheries biologists to milk the females for eggs to supply walleye fry to many lakes in Indiana.