South Dakota Codified Laws
Chapter 19 - River Basin Natural Resource Districts
Section 46A-19-10 - Belle Fourche River and Cheyenne River district.

46A-19-10. Belle Fourche River and Cheyenne River district.
The Belle Fourche River and the Cheyenne River Basin Natural Resource District is hereby established. The district shall include the portions of Butte, Custer, Fall River, Haakon, Lawrence, Meade, Oglala Lakota, Pennington, and Ziebach and counties located in the Belle Fourche River hydrologic basin and the Cheyenne River hydrologic basin.

Source: SL 2015, ch 227, ยง10.