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Snowmelt Peak Streamflow Volume Forecast Table

Snowmelt Peak Streamflow Volume Forecast Table

Snowmelt peak volume flows using May 1, 2013 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 (1971 to 2000)
Bitterroot River near Darby 3350 to 5000 61 to 92 5,454
Blackfoot River near Bonner 4700 to 8100 55 to 95 8,512
Clark Fork River above Missoula 7000 to 12000 48 to 82 14,698
Clark Fork River at St. Regis 18500 to 35000 51 to 97 35,987
Clark Fork River below Missoula 14150 to 26000 50 to 91 28,482
Fisher River near Libby 1200 to 2650 51 to 114 2,334
Little Blackfoot River near Garrison 425 to 750 38 to 67 1,115**
Lower Willow Creek Reservoir Inflow 50 to 105 23 to 49 214
Middle Fork Flathead River near West Glacier 16500 to 23900 86 to 125 19,126
Middle Fork Rock Creek near Phillipsburg 360 to 590 44 to 72 821
Nevada Creek near Helmville 80 to 230 27 to 76 301
North Fork Flathead River near Columbia Falls 15500 to 25500 78 to 129 19,788
Prospect Creek at Thompson Falls 700 to 1275 57 to 105 1,219**
Swan River near Big Fork 3750 to 5700 76 to 116 4,929
Thompson River near Thompson Falls 1200 to 1950 59 to 95 2,047**
Tobacco River near Eureka 1040 to 1575 86 to 130 1,216
Yaak River near Troy 3550 to 6700 61 to 114 5,859

Missouri River Basin
Watershed Peak Daily cfs Peak as Percent of Average Average Daily Peak in cfs (1971 to 2000)
Badger Creek near Browning 900 to 1750 53 to 103 1,691
Big Hole River below Big Lake Creek at Wisdom 500 to 1400 32 to 89 1566**
Big Hole River near Melrose 2700 to 5900 38 to 83 7,139
Boulder River near Boulder 500 to 910 42 to 77 1,183**
Clark Canyon Reservoir Inflow 150 to 775 13 to 65 1,191
Cut Bank Creek near Browning 760 to 1080 89 to 126 857**
Dearborn River near Craig 1025 to 1525 60 to 90 1,697
Gallatin River near Gateway 3600 to 5200 69 to 99 5,232
Gallatin River at Logan 3150 to 5400 58 to 99 5,468
Gibson Reservoir Inflow 4200 to 7000 55 to 91 7,697
Hyalite Reservoir Inflow 160 to 275 61 to 105 262
Jefferson River near Three Forks 2350 to 5600 24 to 58 9,626
Marias River near Shelby 3200 to 6000 46 to 86 6,980
Missouri River at Toston 10000 to 17000 55 to 93 18,209
Musselshell River at Harlowton 350 to 775 27 to 60 1,293
North Fork Musselshell River near Delpine 17 to 53 35 to 108 49
Ruby Reservoir Inflow 340 to 875 32 to 83 1,055
Sheep Creek near White Sulphur Springs 125 to 210 66 to 111 190
Musselshell River near Martinsdale 340 to 800 30 to 71 1,133
Swift Reservoir Inflow 500 to 1075 43 to 93 1,162
Two Medicine River near Browning 1725 to 2750 45 to 72 3,838
Willow Creek Reservoir Inflow 65 to 175 30 to 81 215

Saskatchewan River Basin
Watershed Peak Range in Daily cfs Peak Range as Percent of Average Average Daily Peak in cfs (1971 to 2000)
Lake Sherburne Inflow 1190 to 1650 70 to 97 1,694
St. Mary River at international boundary 4000 to 5750 96 to 137 4,188

Yellowstone River Basin
Watershed Peak Range in Daily cfs Peak Range as Percent of Average Average Daily Peak in cfs (1971 to 2000)
Boulder River near Big Timber 3500 to 5000 69 to 99 5,051
Clarks Fork River near Belfry 5150 to 8250 68 to 109 7,554
Cooney Reservoir Inflow 265 to 850 32 to 102 831
Little Bighorn River near Hardin 560 to 1260 30 to 66 1,895
Little Goose Creek near Big Horn Wyoming 90 to 375 27 to 111 338
West Rosebud near Roscoe 620 to 1030 65 to 109 948
Powder River at Moorehead 1200 to 5200 27 to 119 4,374
Shields River near Livingston 600 to 1350 31 to 70 1,940
Stillwater River near Absarokee 3600 to 5900 59 to 96 6,129
Tongue River Reservoir Inflow 1300 to 3200 41 to 100 3,199
Tongue River near Dayton Wyoming 350 to 1300 35 to 129 1,006
Yellowstone River at Billings 25000 to 39000 60 to 94 41,617
Yellowstone River at Corwin Springs 13250 to 18000 75 to 102 17,570
Yellowstone River at Lake outlet 3900 to 5300 71 to 97 5,487
Yellowstone River at Livingston 12000 to 22800 59 to 112 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.