Montana Snowpack & River Runoff
Snow-water equivalent by basin and the seasonal runoff outlook for Montana's rivers, translated into what it means for fishing — early or late runoff, high or low summer flows, and which waters hold up best. Updated daily through the snow season.
| River | Region | Basin snowpack | SWE now / normal | Median melt-out | Runoff forecast |
|---|---|---|---|---|---|
| Big Hole River | Southwest Montana | — | 0.1" / 0.0" | ~Jul 1 | 73% |
| Bighorn River | South Central Montana | — | 0.0" / 0.0" | ~Jun 20 | 67% |
| Bitterroot River | Western Montana | — | 0.0" / 0.0" | ~Jun 11 | 61% |
| Blackfoot River | Western Montana | — | 0.0" / 0.0" | ~Jun 6 | 97% |
| Clark Fork River | Western Montana | — | 0.0" / 0.0" | ~Jun 23 | 97% |
| Flathead River | Northwest Montana | — | 0.0" / 0.0" | ~Jun 28 | 82% |
| Gallatin River | Southwest Montana | — | 0.0" / 0.0" | ~Jun 24 | 68% |
| Madison River | Southwest Montana | — | 0.0" / 0.0" | ~Jun 24 | 63% |
| Middle Fork Flathead River | Northwest Montana | — | 0.0" / 0.0" | ~Jul 4 | 81% |
| Missouri River | Central Montana | — | 0.0" / 0.0" | ~Jun 24 | 66% |
| North Fork Flathead River | Northwest Montana | — | 0.0" / 0.0" | ~Jul 4 | 91% |
| Rock Creek | Western Montana | — | 0.0" / 0.0" | ~Jun 8 | 98% |
| Ruby River | Southwest Montana | — | 0.0" / 0.0" | ~May 28 | 63% |
| Smith River | Central Montana | — | 0.0" / 0.0" | ~Jun 10 | 71% |
| South Fork Flathead River | Northwest Montana | — | 0.0" / 0.0" | ~Jun 28 | 81% |
| Stillwater River | South Central Montana | — | 0.0" / 0.0" | ~Jun 30 | 84% |
| Yellowstone River | Southwest Montana | — | 0.0" / 0.0" | ~Jun 18 | 79% |