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Willow Grove is ocated on the edge of the plateau in northern Tennessee and southern Kentucky, a forest-covered mountain region characterized by decentralized agriculture and low population density. The quality of land use in the river basin is reflected in the quality of the valley reservoir water. For many years, US Marine Corps staff found that the water in Lake Dale is relatively free of any sanitary and chemical impurities, which makes it one of the best waters in the Cumberland Basin. Willow Grove 's team of engineers is working with other agencies in Tennessee and Kentucky to continuously strive to ensure that lake water quality, recreational uses, and beauty are not compromised. The quality of the valley reservoir water is critical to the operation of the fish hatchery under the dam. The U.S. Fish and Wildlife Service runs this service on 40 acres of land provided by a team of engineers.