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 | Date | Today SWE (inches) | Today SWE % of Median | Minimum SWE (in) | 10th Percentile (inches) | 30th Percentile Inches | Median (inches) | 70th Percentile (inches) | 90th Percentile (inches) | Maximum (inches) | Last Year SWE (inches) | Last Year SWE % of Median |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Belle Fourche | 18 May 2026 | 0.00 | 0 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.83 | 0.00 | 0 |
| Bighorn | 18 May 2026 | 0.00 | 0 | 0.99 | 3.26 | 5.56 | 7.34 | 9.31 | 13.52 | 16.15 | 5.07 | 69 |
| Cheyenne | 18 May 2026 | 0.00 | 0 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.95 | 0.00 | 0 |
| Laramie | 18 May 2026 | 0.00 | 0 | 0.03 | 4.05 | 6.90 | 8.56 | 13.34 | 17.05 | 24.77 | 4.49 | 52 |
| Little Snake | 18 May 2026 | 0.00 | 0 | 1.55 | 3.37 | 6.31 | 9.61 | 12.15 | 17.16 | 24.60 | 5.53 | 58 |
| Lower Green | 18 May 2026 | 0.00 | 0 | 1.16 | 2.18 | 3.00 | 4.23 | 6.83 | 9.47 | 14.90 | 2.85 | 67 |
| Lower North Platte | 18 May 2026 | 0.00 | 0 | 0.00 | 0.00 | 0.46 | 2.92 | 5.82 | 9.57 | 22.30 | 0.50 | 17 |
| Madison | 18 May 2026 | 0.00 | 0 | 0.04 | 3.98 | 9.13 | 12.56 | 17.00 | 20.99 | 25.40 | 7.76 | 62 |
| Powder | 18 May 2026 | 0.00 | 0 | 0.00 | 0.88 | 2.74 | 4.44 | 7.09 | 10.65 | 13.50 | 1.53 | 34 |
| Shoshone | 18 May 2026 | 0.00 | 0 | 2.78 | 5.45 | 9.03 | 12.40 | 18.13 | 23.83 | 30.64 | 8.12 | 65 |
| Snake | 18 May 2026 | 0.00 | 0 | 0.95 | 4.07 | 8.44 | 12.53 | 16.05 | 22.96 | 31.38 | 10.38 | 83 |
| South Platte | 18 May 2026 | 0.00 | 0 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.09 | 0.30 | 0.00 | 0 |
| Sweetwater | 18 May 2026 | 0.00 | 0 | 0.00 | 1.68 | 5.05 | 6.87 | 10.46 | 19.76 | 25.70 | 4.47 | 65 |
| Tongue | 18 May 2026 | 0.00 | 0 | 0.00 | 1.75 | 5.53 | 7.51 | 10.53 | 15.31 | 18.60 | 5.83 | 78 |
| Upper Bear | 18 May 2026 | 0.00 | 0 | 0.00 | 1.74 | 4.29 | 6.63 | 11.92 | 18.57 | 29.51 | 3.76 | 57 |
| Upper Green | 18 May 2026 | 0.00 | 0 | 0.07 | 2.40 | 6.06 | 7.84 | 10.68 | 19.76 | 27.02 | 6.16 | 79 |
| Upper North Platte | 18 May 2026 | 0.00 | 0 | 2.67 | 8.42 | 12.57 | 16.17 | 20.75 | 28.52 | 36.52 | 11.18 | 69 |
| Wind | 18 May 2026 | 0.00 | 0 | 1.55 | 3.07 | 5.83 | 8.34 | 11.92 | 17.79 | 23.74 | 5.48 | 66 |
| Yellowstone | 18 May 2026 | 0.00 | 0 | 2.15 | 9.35 | 13.27 | 16.53 | 21.65 | 25.59 | 30.06 | 14.08 | 85 |