Lakes In Dewey County - Isabel Lake
Dewey County is located in the state of South Dakota. It encompasses a total of 2,446 miles with 143 miles being water. The population as of last census was 5,301. This is one of five South Dakota counties that lies entirely on Indian reservations, which are Cheyenne River Indian Reservation and Standing Rock Indian Reservation. Share what you love about Dewey County South Dakota !