Lacreek National Wildlife Refuge (NWR) was established in 1935 as a refuge and breeding ground for migratory birds and other wildlife. The Refuge is located in Bennett County in southwestern South Dakota. The Refuge lies in the shallow Lake Creek valley on the northern edge of the Nebraska sandhills and includes 16,410 acres of native sandhills, sub-irrigated meadows, impounded fresh water marshes, and tallgrass and mixed-grass prairie uplands.