Water Administration Basin Map

Find your location on the map, then scroll to the table below to find the corresponding administrative basin. For a more detailed, interactive map, visit the Water Rights Query System and turn on the "Basins" map layer.

Basin #	Basin Name	Basin #	Basin Name
38H	Belle Fourche River, Above Cheyene River	39FJ	Little Beaver Creek
39E	Box Elder Creek	39G	Beaver Creek, Tributary of Little Missouri River
39F	Little Missouri River, Above Little Beaver Creek	39H	Little Missouri, Below Little Beaver Creek
40A	Musselshell River, Above Roundup	40J	Milk River, Between Fresno Reservoir and Whitewater Creek
40C	Musselshell River, Below Roundup	40K	Whitewater Creek
40D	Big Dry Creek	40L	Frenchman Creek
40E	Missouri River, Between Musselshell River and Fort Peck Dam	40M	Beaver Creek, Tributary of Milk River
40EJ	Missouri River, Between Bullwhacker Creek and Musselshell Rivers	40N	Rock Creek, Tributary of Milk River
40F	Milk River, Above Fresno Reservoir	40O	Milk River, Below Whitewater Including Porcupine Creek
40G	Sage Creek	40P	Redwater River
40H	Big Sandy Creek	40Q	Poplar River
41A	Red Rock River	40R	Big Muddy Creek
41B	Beaverhead River	41M	Two Medicine River
41C	Ruby River	41N	Willow Creek
41D	Big Hole River	41O	Teton River
41E	Boulder River, Tributary of Jefferson River	41P	Marias River
41F	Madison River	41Q	Missouri River, From Sun to Marias River
41G	Jefferson River	41QJ	Missouri River, From Holter Dam to Sun River
41H	Gallatin River	41R	Arrow Creek
41I	Missouri River, Above Holter Dam	41S	Judith River
41J	Smith River	41T	Missouri River, From Marias River to and Including Bullwhacker Creek
41K	Sun River	41U	Dearborn River
41L	Cut Bank Creek	42J	Powder River, Below Clear Creek
42A	Rosebud Creek	42K	Yellowstone River, Between Tongue and Powder Rivers
42B	Tongue River, Above and Including Hanging Woman Creek	42KJ	Yellowstone River, Between Bighorn and Tongue Rivers
42C	Tongue River, Below Hanging Woman Creek	42L	O’Fallon Creek
42I	Little Powder River	42M	Yellowstone River, Below Powder River
43A	Shields River	43E	Pryor Creek
43B	Yellowstone River, Above and Including Bridger Creek	43N	Shoshone River
43BJ	Boulder River, Tributary of Yellowstone River	43O	Little Bighorn River
43BV	Sweet Grass Creek	43P	Bighorn River, Below Greybull River
43C	Stillwater River	43Q	Yellowstone River, Between Clarks Fork Yellowstone and Bighorn River
43D	Clarks Fork Yellowstone River	43QJ	Yellowstone River, From Bridger Creek to Clarks Fork Yellowstone River
76B	Yaak River	76I	Flathead River, Middle Fork
76C	Fisher River	76J	Flathead River, South Fork
76D	Kootenai River	76K	Swan River
76E	Rock Creek, Tributary of Clark Fork River	76L	Flathead River, Below Flathead Lake
76F	Blackfoot River	76LJ	Flathead River, to and Including Flathead Lake
76G	Clark Fork, Above Blackfoot River	76M	Clark Fork, Between Blackfoot and Flathead Rivers
76GJ	Flint Creek	76N	Clark Fork, Below Flathead River
76H	Bitterroot River