Water Resources Data System & State Climate Office
Water Resources Data System & State Climate Office
Water Resources Data System & State Climate Office
| Basin Click to View Chart | This Year Peak Date | This Year Peak SWE (inches) | Days Early/Late | Peak SWE Dif (inches) | Percent of Median Peak SWE | Median Peak Date | Median Peak SWE (inches) | Current SWE | Median Meltout Date |
|---|---|---|---|---|---|---|---|---|---|
| Belle Fourche | 16 Mar 2026 | 3.93 | -12 | -2.9 | 57% | 28 Mar  | 6.87 | 0.00 | 01 May |
| Bighorn | 17 Mar 2026 | 7.67 | -38 | -4.1 | 65% | 24 Apr | 11.74 | 0.06 | 21 Jun |
| Cheyenne | 02 Mar 2026 | 4.25 | -25 | -3.2 | 57% | 28 Mar | 7.50 | 0.00 | 01 May |
| Laramie | 17 Mar 2026 | 8.21 | -29 | -7.7 | 52% | 15 Apr | 15.90 | 0.00 | 13 Jun |
| Little Snake | 09 Mar 2026 | 12.35 | -27 | -8.2 | 60% | 06 Apr | 20.50 | 0.12 | 19 Jun |
| Lower Green | 16 Mar 2026 | 8.86 | -23 | -4.7 | 65% | 08 Apr | 13.58 | 0.00 | 12 Jun |
| Lower North Platte | 17 Mar 2026 | 5.15 | -28 | -7.6 | 40% | 14 Apr | 12.75 | 0.10 | 29 May |
| Madison | 17 Mar 2026 | 14.88 | -27 | -6.1 | 71% | 13 Apr | 20.98 | 0.12 | 25 Jun |
| Powder | 17 Mar 2026 | 6.30 | -28 | -4.3 | 59% | 14 Apr | 10.61 | 0.14 | 10 Jun |
| Shoshone | 17 Mar 2026 | 15.93 | -37 | -2.1 | 89% | 23 Apr | 17.98 | 0.37 | 27 Jun |
| Snake | 17 Mar 2026 | 18.05 | -25 | -2.8 | 86% | 11 Apr | 20.89 | 0.13 | 29 Jun |
| South Platte | 07 May 2026 | 1.60 | 39 | -4.7 | 25% | 29 Mar | 6.30 | 0.00 | 25 Apr |
| Sweetwater | 17 Mar 2026 | 10.73 | -32 | -4.3 | 71% | 18 Apr | 15.03 | 0.00 | 06 Jun |
| Tongue | 17 Mar 2026 | 6.47 | -45 | -6.8 | 49% | 01 May | 13.30 | 0.00 | 10 Jun |
| Upper Bear | 09 Mar 2026 | 12.03 | -30 | -5.8 | 68% | 09 Apr | 17.81 | 0.10 | 16 Jun |
| Upper Green | 18 Mar 2026 | 13.41 | -24 | -2.6 | 84% | 11 Apr | 15.96 | 0.01 | 16 Jun |
| Upper North Platte | 17 Mar 2026 | 13.87 | -30 | -10.5 | 57% | 16 Apr | 24.35 | 0.23 | 29 Jun |
| Wind | 17 Mar 2026 | 11.37 | -34 | -2.6 | 81% | 20 Apr | 13.97 | 0.06 | 25 Jun |
| Yellowstone in WY | 18 Mar 2026 | 20.71 | -37 | -0.1 | 100% | 24 Apr | 20.81 | 0.01 | 01 Jul |