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	0.600000023841858
2	Tobacco River	1.79999995231628
3	Kootenai Ft. Steele to Libby Dam	1.79999995231628
4	Kootenai River below Libby Dam	2.20000004768372
4	Fisher River	1.5
6	Yaak River	0.600000023841858
7	North FK. Flathead River	2.09999990463257
8	Middle FK. Flathead River	2.09999990463257
9	South FK. Flathead River	3.79999995231628
10	Flathead River at Columbia Falls	3.20000004768372
11	Stillwater/Whitefish Rivers
12	Swan River	3.29999995231628
13	Flathead River at Polson	2.5
14	Mission Valley
15	Little Bitterroot River
16	Clark Fork River above Milltown	2.59999990463257
17	Blackfoot River	2.79999995231628
18	Clark Fork River above Missoula	2.79999995231628
19	Bitterroot River	1.79999995231628
20	Clark Fork River below Bitterroot River	2.5
21	Clark Fork River below Flathead River	2.5
22	Beaverhead River	0.600000023841858
23	Ruby River	0.600000023841858
24	Big Hole River	1.5
25	Boulder River (Jefferson)	2.59999990463257
26	Jefferson River	1.70000004768372
27	Madison River	1.10000002384186
28	Gallatin River	2.09999990463257
29	Missouri River above Canyon Ferry	2
30	Missouri River below Canyon Ferry	0.899999976158142
31	Smith River	2
32	Sun River	2
33	Teton River	1.20000004768372
34	Birch/Dupuyer Creeks	-0.400000005960464
35	Marias River below Tiber Reservoir	1.79999995231628
36	Musselshell River	1.10000002384186
37	Missouri River above Fort Peck	0.600000023841858
38	Missouri River below Fort Peck	1.60000002384186
39	Milk River
40	Dearborn River near Craig
41	Yellowstone River above Livingston	3.5
42	Shields River	3.40000009536743
43	Boulder River (Yellowstone)	3
44	Stillwater River	3.20000004768372
45	Rock/Red Lodge Creeks	0.899999976158142
46	Clarks Fork River	4
47	Yellowstone River above Bighorn River	3.40000009536743
48	Bighorn River below Bighorn Lake	2.79999995231628
49	Little Bighorn River	0
50	Yellowstone River below Bighorn River	2.79999995231628
51	Tongue River	-0.899999976158142
52	Powder River	0.899999976158142
53	Upper Judith Basin
54	St. Mary River	1.79999995231628

March 2018
Surface Water Supply Index Report

Provided by the US Natural Resources Conservation Service
Bozeman, Montana

March 2018 Surface Water Supply Index Report

Provided by the US Natural Resources Conservation Service Bozeman, Montana

March 2018
Surface Water Supply Index Report

Provided by the US Natural Resources Conservation Service
Bozeman, Montana