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 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
59
Moderate
Drought index
376
Extreme
Area in D2+
100%
0% exceptional (D4)
Gauges below normal
0%
of 1 reporting
Median flow
1%
p25 of record
Water assets
2,790
0 springs · 415 wells
USGS gauges (1)
- POWDER RIVER AT ARVADA, WY063170000 cfsp25 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 376 | 100 | 0/1 | p25 |
Top water assets
- 68Tabascoreservoir
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- 68Michelena #3reservoir
- 68Willreservoir
- 68Iberlin 43-3-4676reservoir
- 67Powder River At Arvada, Wyriver
- 67Wild Horse Creekriver
- 67Ethel #3reservoir
- 67T55Nr75W22Nwnereservoir
- 67Powder Riverriver