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	0.800000011920929
2	Tobacco River	0.400000005960464
3	Kootenai Ft. Steele to Libby Dam	2.59999990463257
4	Kootenai River below Libby Dam	3.79999995231628
5	Fisher River	0.300000011920929
6	Yaak River	-0.100000001490116
7	North Fk. Flathead River	0.600000023841858
8	Middle Fk. Flathead River	1.10000002384186
9	South Fk. Flathead River	3.20000004768372
10	Flathead River at Columbia Falls	1.5
11	Stillwater/Whitefish
12	Swan River	0.800000011920929
13	Flathead River at Polson	1.29999995231628
14	Mission Valley
15	Little Bitterroot River
16	Clark Fork River above Milltown	0.800000011920929
17	Blackfoot River	0.600000023841858
18	Clark Fork River above Missoula	0.100000001490116
19	Bitterroot River	1.10000002384186
20	Clark Fork River below Bitterroot River	0.400000005960464
21	Clark Fork River below Flathead River	1
22	Beaverhead River	1.60000002384186
23	Ruby River	0.899999976158142
24	Big Hole River	1.60000002384186
25	Boulder River (Jefferson)	3.20000004768372
26	Jefferson River	1.89999997615814
27	Madison River	1.29999995231628
28	Gallatin River	0.899999976158142
29	Missouri River above Canyon Ferry	1.10000002384186
30	Missouri River below Canyon Ferry	0.899999976158142
31	Smith River	2
32	Sun River	1.29999995231628
33	Teton River	1
34	Birch/Dupuyer Creeks	2.5
35	Marias River below Tiber Reservoir	2.59999990463257
36	Musselshell River	1.5
37	Missouri River above Fort Peck	1.79999995231628
38	Missouri River below Fort Peck	2.59999990463257
39	Milk River
40	Dearborn River near Craig
41	Yellowstone River above Livingston	2
42	Shields River	1.70000004768372
43	Boulder River (Yellowstone)	2.09999990463257
44	Stillwater River	2.5
45	Rock/Red Lodge Creeks	2.09999990463257
46	Clarks Fork River	3.20000004768372
47	Yellowstone River above Bighorn River	2.40000009536743
48	Bighorn River below Bighorn Lake	0.899999976158142
49	Little Bighorn River	-0.800000011920929
50	Yellowstone River below Bighorn River	0.899999976158142
51	Tongue River	-0.400000005960464
52	Powder River	0.800000011920929
53	Upper Judith Basin
54	St. Mary River	1.5

June 2018
Surface Water Supply Index Report

Provided by the US Natural Resources Conservation Service
Bozeman, Montana

June 2018 Surface Water Supply Index Report

Provided by the US Natural Resources Conservation Service Bozeman, Montana

June 2018
Surface Water Supply Index Report

Provided by the US Natural Resources Conservation Service
Bozeman, Montana