Below are snowmelt peak dates for 2009. These are dates for snowmelt peaks and
NOT
rainfall peaks that might occur after the snowmelt peaks. This information DOES
NOT apply to streamflows below reservoirs.
Columbia River Basin
| Watershed |
Snowmelt Peak Flow Dates |
| Bitterroot River near Darby |
May 31 |
| Bitterroot River at Missoula |
June 1 |
| Blackfoot River near Bonner |
June 1 |
| Clark Fork River above Missoula |
May 26, May 31, and June 1 |
| Clark Fork River at St. Regis |
June 1 |
| Clark Fork River below Missoula |
June 1 |
| Como Reservoir Inflow |
May 30 |
| Fisher River near Libby |
May 20 |
| Little Blackfoot River near Garrison |
May 20 |
| Lower Willow Creek Reservoir Inflow |
May 23 to May 29 |
| Middle Fork Flathead River near West Glacier |
May 31 |
| Middle Fork Rock Creek near Phillipsburg |
May 31 and June 1 |
| Nevada Creek near Helmville |
May 20 |
| North Fork Flathead River near Columbia Falls |
May 31 |
| Prospect Creek at Thompson Falls |
May 19 and May 20 |
| South Fork Flathead River above Twin Creeks |
May 31 |
| South Fork Jocko River near Arlee |
May 31 |
| Swan River near Big Fork |
June 2 |
| Thompson River near Thompson Falls |
May 19 |
| Tobacco River near Eureka |
May 31 |
| Yaak River near Troy |
May 19 |
Missouri River Basin
| Watershed |
Snowmelt Peak Flow Dates |
| Badger Creek near Browning |
May 31 |
| Big Hole River below Big Lake Creek at Wisdom |
May 26 |
| Big Hole River near Melrose |
June 1 |
| Boulder River near Boulder |
May 20 |
| Clark Canyon Reservoir Inflow |
June 8 |
| Cut Bank Creek near Browning |
May 31 |
| Dearborn River near Craig |
May 20 |
| Gallatin River near Gateway |
May 31 |
| Gallatin River at Logan |
June 1 |
| Gibson Reservoir Inflow |
May 31 |
| Hebgen Reservoir Inflow |
May 20 |
| Hyalite Reservoir Inflow |
May 28 to June 3 |
| Jefferson River near Three Forks |
June 2 |
| Madison River near West Yellowstone |
May 23 to May 29 |
| Marias River near Shelby |
June 1 |
| Missouri River at Toston |
June 1 |
| Musselshell River at Harlowton |
May 22 |
| North Fork Musselshell River near Delpine |
May 24 to May 30 |
| Ruby Reservoir Inflow |
May 20 |
| Sheep Creek near White Sulphur Springs |
May 26 to June 1 |
| Smith River below Eagle Creek near Fort Logan |
May 20 |
| Musselshell River near Martinsdale |
May 21 |
| Swift Reservoir Inflow |
May 31 |
| Two Medicine River near Browning |
May 31 |
| Willow Creek near Harrison |
June 21 |
Yellowstone River Basin
| Watershed |
Snowmelt Peak Flow Dates |
| Boulder River near Big Timber |
June 1 |
| Clarks Fork River near Belfry |
May 31 |
| Cooney Reservoir inflow |
June 3 |
| Little Bighorn River near Hardin |
June 3 |
| Little Goose Creek near Bighorn Wyoming |
May 29 to June 4 |
| Mystic Reservoir Inflow |
June 3 |
| Powder River at Moorehead |
May 22 |
| Shields River near Livingston |
May 21 |
| Stillwater River near Absarokee |
June 1 |
| Tongue River at Dayton Wyoming |
May 25 |
| Tongue River Reservoir Inflow |
June 1 |
| Yellowstone River at Billings |
June 1 |
| Yellowstone River at Corwin Springs |
May 30 |
| Yellowstone River at Lake outlet |
July 4 |
| Yellowstone River at Livingston |
June 1 |
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