Upper Yellowstone-Pompeys Pillar HUC8 10070007
A 5,202 km² sub-basin of the Missouri region in MT. 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
76
Healthy
Drought index
17
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
—
no gauges reporting
Median flow
—
of normal for the date
Water assets
1,010
32 springs · 297 wells
USGS gauges (0)
No active discharge gauges in this sub-basin.
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-20 | 17 | 0 | — | — |
| 2026-10-19 | 17 | 0 | — | — |
| 2026-10-18 | 17 | 0 | — | — |
| 2026-10-17 | 17 | 0 | — | — |
| 2026-10-16 | 17 | 0 | — | — |
| 2026-10-15 | 102 | 0 | — | — |
| 2026-10-14 | 102 | 0 | — | — |
| 2026-10-13 | 102 | 0 | — | — |
| 2026-10-12 | 102 | 0 | — | — |
| 2026-10-11 | 102 | 0 | — | — |
| 2026-10-10 | 102 | 0 | — | — |
| 2026-10-09 | 102 | 0 | — | — |
| 2026-10-08 | 200 | 0 | — | — |
| 2026-10-07 | 200 | 0 | — | — |
Top water assets
- 67Yellowstone Riverriver
- 67Fly Creekriver
- 67Yellowstone Riverriver
- 67Railroad Creekriver
- 67Yellowstone Riverriver
- 67Arrow Creekriver
- 67Fly Creekriver
- 67Railroad Creekriver
- 67Buffalo Creekriver
- 67Fly Creekriver