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Snowmelt Peak Streamflow Volume Forecast Table

 Snowmelt peak volume flows using May 1, 2014 data. These projected flows are based strictly on snowmelt and do not account for any additional rain. Actual flows may be affected by upstream reservoir management in particular watersheds.
 

 

Columbia River Basin
Watershed Peak Daily cfs Peak as Percent of Average Average Daily Peak in cfs (1981 to 2010)
Bitterroot River near Darby 6400 to 9000 117 to 165 5,454
Blackfoot River near Bonner 9200 to 13900 108 to 163 8,512
Clark Fork River above Missoula 16200 to 23200 110 to 158 14,698
Clark Fork River at St. Regis 40400 to 59500 112 to 165 35,987
Clark Fork River below Missoula 32600 to 44600 114 to 157 28,482
Fisher River near Libby 1910 to 3400 82 to 146 2,334
Little Blackfoot River near Garrison 1150 to 1660 103 to 149 1,115**
Lower Willow Creek Reservoir Inflow 242 to 360 113 to 168 214
Middle Fork Flathead River near West Glacier 18200 to 26300 95 to 138 19,126
Middle Fork Rock Creek near Phillipsburg 780 to 1260 95 to 153 821
Nevada Creek near Helmville 375 to 570 125 to 189 301
North Fork Flathead River near Columbia Falls 16400 to 26400 83 to 133 19,788
Prospect Creek at Thompson Falls 1150 to 1710 94 to 140 1,219**
Swan River near Big Fork 5000 to 7000 101 to 142 4,929
Thompson River near Thompson Falls 1900 to 2800 93 to 137 2,047**
Tobacco River near Eureka 1250 to 1800 103 to 148 1,216
Yaak River near Troy 4100 to 7400 70 to 126 5,859
Missouri River Basin
Watershed Peak Daily cfs Peak as Percent of Average Average Daily Peak in cfs (1981 to 2010)
Badger Creek near Browning 1200 to 2200 71 to 130 1,691
Big Hole River below Big Lake Creek at Wisdom 1450 to 2390 93 to 153 1566**
Big Hole River near Melrose 6300 to 12000 88 to 168 7,139
Boulder River near Boulder 1180 to 1600 100 to 135 1,183**
Clark Canyon Reservoir Inflow 350 to 1120 29 to 94 1,191
Cut Bank Creek near Browning 940 to 1300 110 to 152 857**
Dearborn River near Craig 1200 to 1750 71 to 103 1,697
Gallatin River near Gateway 5000 to 7000 96 to 134 5,232
Gallatin River at Logan 5450 to 7900 100 to 144 5,468
Gibson Reservoir Inflow 5800 to 8800 75 to 114 7,697
Hyalite Reservoir Inflow 225 to 350 86 to 134 262
Jefferson River near Three Forks 7800 to 11400 81 to 118 9,626
Marias River near Shelby 4700 to 8000 67 to 115 6,980
Missouri River at Toston 18200 to 29300 100 to 161 18,209
Musselshell River at Harlowton 1150 to 1940 89 to 150 1,293
North Fork Musselshell River near Delpine 36 to 76 73 to 155 49
Ruby Reservoir Inflow 580 to 1100 55 to 104 1,055
Sheep Creek near White Sulphur Springs 175 to 285 92 to 150 190
Musselshell River near Martinsdale 650 to 1460 57 to 129 1,133
Swift Reservoir Inflow 600 to 1210 52 to 104 1,162
Two Medicine River near Browning 2350 to 3400 61 to 89 3,838
Willow Creek Reservoir Inflow 290 to 410 135 to 191 215
Saskatchewan River Basin
Watershed Peak Daily cfs Peak as Percent of Average Average Daily Peak in cfs (1981 to 2010)
Lake Sherburne Inflow 1080 to 1830 64 to 108 1,694
St. Mary River at international boundary 4500 to 6900 107 to 165 4,188
Yellowstone River Basin
Watershed Peak Daily cfs Peak as Percent of Average Average Daily Peak in cfs (1981 to 2010)
Boulder River near Big Timber 4600 to 7200 91 to 143 5,051
Clarks Fork River near Belfry 8700 to 12000 115 to 159 7,554
Cooney Reservoir Inflow 620 to 1320 75 to 159 831
Little Bighorn River near Hardin 1500 to 2400 79 to 127 1,895
Little Goose Creek near Big Horn Wyoming 340 to 640 101 to 189 338
West Rosebud near Roscoe 780 to 1300 82 to 137 948
Powder River at Moorehead 3200 to 8100 73 to 185 4,374
Shields River near Livingston 1700 to 2700 88 to 139 1,940
Stillwater River near Absarokee 5900 to 9000 96 to 147 6,129
Tongue River Reservoir Inflow 3400 to 5400 106 to 169 3,199
Tongue River near Dayton Wyoming 1050 to 1880 104 to 187 1,006
Yellowstone River at Billings 45000 to 61900 108 to 149 41,617
Yellowstone River at Corwin Springs 19000 to 27000 108 to 154 17,570
Yellowstone River at Lake outlet 5200 to 7800 95 to 142 5,487
Yellowstone River at Livingston 21500 to 32500 106 to 160 20,364

 

* Provisional data values and are subject to revision.
** Site has less than 30 years record -- average values are for period of record available.
E - Site has less than 30 years record -- average values are estimated 30 year averages.

NOTE: The low number in the flow range represents the maximum daily flow that would be expected to occur with little rainfall during the peak snowmelt period. The high number in the flow range could be expected with moderate amounts of rain about the same time as maximum snowmelt runoff is occurring.