Upper Powder HUC8 10090202
A 6,464 km² sub-basin of the Missouri region in WY. Drought coverage is from the US Drought Monitor (map of 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
40
Stressed
Drought index
372
Extreme
Area in D2+
100%
0% exceptional (D4)
Gauges below normal
100%
of 1 reporting
Median flow
35%
p12 of record
Water assets
2,790
0 springs · 415 wells
USGS gauges (1)
- POWDER RIVER AT ARVADA, WY0631700040 cfsp12 · below normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-20 | 372 | 100 | 1/1 | p12 |
| 2026-10-19 | 372 | 100 | 1/1 | p9 |
| 2026-10-18 | 372 | 100 | 1/1 | p8 |
| 2026-10-17 | 372 | 100 | 1/1 | p3 |
| 2026-10-16 | 372 | 100 | 1/1 | p5 |
| 2026-10-15 | 372 | 100 | 1/1 | p7 |
| 2026-10-14 | 372 | 100 | 1/1 | p6 |
| 2026-10-13 | 372 | 100 | 1/1 | p7 |
| 2026-10-12 | 372 | 100 | 1/1 | p7 |
| 2026-10-11 | 372 | 100 | 1/1 | p7 |
| 2026-10-10 | 372 | 100 | 1/1 | p11 |
| 2026-10-09 | 372 | 100 | 1/1 | p12 |
| 2026-10-08 | 372 | 100 | 1/1 | p13 |
| 2026-10-07 | 372 | 100 | 1/1 | p14 |
Top water assets
- 68Tabascoreservoir
- 68Lower Morganreservoir
- 68Michelena #3reservoir
- 68Willreservoir
- 68Iberlin 43-3-4676reservoir
- 67Powder River At Arvada, Wyriver
- 67Wild Horse Creekriver
- 67Ethel #3reservoir
- 67T55Nr75W22Nwnereservoir
- 67Powder Riverriver