Surface Water Supply Index Report

The SWSI is designed for areas that rely primarily on snowmelt runoff as the primary source of surface water. The SWSI accounts for snowpack, mountain precipitation, streamflow, reservoir contents, and soil moisture conditions. The SWSI can be used by irrigators, fisheries personnel, recreationists, and others who utilize surface waters. SWSI values are categorized as follows:

ID	Basin Name	SWSI
1	Marias River above Tiber Reservoir	2
2	Tobacco River	2.29999995231628
3	Kootenai Ft. Steele to Libby Dam	2.79999995231628
4	Kootenai River below Libby Dam	3.29999995231628
5	Fisher River	1.60000002384186
6	Yaak River	1.79999995231628
7	North Fk. Flathead River	2.5
8	Middle Fk. Flathead River	2.29999995231628
9	South Fk. Flathead River	2.5
10	Flathead River at Columbia Falls	2.5
11	Stillwater/Whitefish
12	Swan River	3.5
13	Flathead River at Polson	3
14	Mission Valley
15	Little Bitterroot River
16	Clark Fork River above Milltown	2.5
17	Blackfoot River	3.29999995231628
18	Clark Fork River above Missoula	3
19	Bitterroot River	2
20	Clark Fork River below Bitterroot River	2.70000004768372
21	Clark Fork River below Flathead River	2.90000009536743
22	Beaverhead River	1.10000002384186
23	Ruby River	1.10000002384186
24	Big Hole River	1.5
25	Boulder River (Jefferson)	2.79999995231628
26	Jefferson River	1.89999997615814
27	Madison River	1.60000002384186
28	Gallatin River	2.09999990463257
29	Missouri River above Canyon Ferry	2.09999990463257
30	Missouri River below Canyon Ferry	0.899999976158142
31	Smith River	2.70000004768372
32	Sun River	2.79999995231628
33	Teton River	2.09999990463257
34	Birch/Dupuyer Creeks	1.29999995231628
35	Marias River below Tiber Reservoir	2.79999995231628
36	Musselshell River	2.29999995231628
37	Missouri River above Fort Peck	1.10000002384186
38	Missouri River below Fort Peck	2.59999990463257
39	Milk River
40	Dearborn River near Craig
41	Yellowstone River above Livingston	3.20000004768372
42	Shields River	3.59999990463257
43	Boulder River (Yellowstone)	2.59999990463257
44	Stillwater River	3.20000004768372
45	Rock/Red Lodge Creeks	0.100000001490116
46	Clarks Fork River	4
47	Yellowstone River above Bighorn River	3.29999995231628
48	Bighorn River below Bighorn Lake	2.29999995231628
49	Little Bighorn River
50	Yellowstone River below Bighorn River	2.29999995231628
51	Tongue River	-0.899999976158142
52	Powder River	1.10000002384186
53	Upper Judith Basin
54	St. Mary River	2.29999995231628

May 2018
Surface Water Supply Index Report

Provided by the US Natural Resources Conservation Service
Bozeman, Montana

May 2018 Surface Water Supply Index Report

Provided by the US Natural Resources Conservation Service Bozeman, Montana

May 2018
Surface Water Supply Index Report

Provided by the US Natural Resources Conservation Service
Bozeman, Montana