Upper Yellowstone-Lake Basin HUC8 10070004
A 4,068 km² sub-basin of the Missouri region in MT. 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
43
Stressed
Drought index
296
Severe
Area in D2+
95.95%
0% exceptional (D4)
Gauges below normal
100%
of 1 reporting
Median flow
66%
p18 of record
Water assets
586
10 springs · 290 wells
USGS gauges (1)
- Yellowstone River at Billings MT062145002,370 cfsp18 · below normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 296 | 95.95 | 1/1 | p18 |
Top water assets
- 67Canyon Creekriver
- 67Yellowstone Riverriver
- 67Yellowstone Riverriver
- 67Yellowstone River At Billings Mtriver
- 67Canyon Creekriver
- 67Yellowstone Riverriver
- 67Yellowstone Riverriver
- 67Yellowstone Riverriver
- 67Yellowstone Riverriver
- 67Canyon Creekriver