Lower Yellowstone-Sunday HUC8 10100001
A 12,447 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
49
Stressed
Drought index
213
Severe
Area in D2+
18.33%
0% exceptional (D4)
Gauges below normal
100%
of 2 reporting
Median flow
71%
p23 of record
Water assets
3,027
213 springs · 687 wells
USGS gauges (2)
- Yellowstone River at Miles City, MT063090004,260 cfsp23 · below normal
- Yellowstone River at Forsyth MT062950004,100 cfsp23 · below normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 213 | 18.33 | 2/2 | p23 |
Top water assets
- 67Yellowstone River At Miles City, Mtriver
- 67Froze-To-Death #3reservoir
- 67Yellowstone Riverriver
- 67West Fork Armells Creekriver
- 67Moore #7reservoir
- 67Yellowstone Riverriver
- 67Lambing Shedreservoir
- 67Yellowstone Riverriver
- 67Custer Creekriver
- 67Little Porcupine Creekriver