Flatwillow HUC8 10040203
A 1,761 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
66
Moderate
Drought index
18
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
100%
of 1 reporting
Median flow
0%
p10 of record
Water assets
351
2 springs · 24 wells
USGS gauges (1)
- Flatwillow Creek near Mosby MT061300000 cfsp10 · below normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-22 | 18 | 0 | 1/1 | p10 |
| 2026-10-21 | 18 | 0 | 1/1 | p10 |
| 2026-10-20 | 18 | 0 | 1/1 | p10 |
| 2026-10-19 | 18 | 0 | 1/1 | p10 |
| 2026-10-18 | 18 | 0 | 1/1 | p10 |
| 2026-10-17 | 18 | 0 | 1/1 | p10 |
| 2026-10-16 | 18 | 0 | 1/1 | p10 |
| 2026-10-15 | 118 | 0 | 1/1 | p10 |
| 2026-10-14 | 118 | 0 | 1/1 | p10 |
| 2026-10-13 | 118 | 0 | 1/1 | p10 |
| 2026-10-12 | 118 | 0 | 1/1 | p10 |
| 2026-10-11 | 118 | 0 | 1/1 | p10 |
| 2026-10-10 | 118 | 0 | 1/1 | p10 |
| 2026-10-09 | 118 | 0 | 1/1 | p10 |
Top water assets
- 69Half Moon Creekriver
- 69North Fork Flatwillow Creekriver
- 69North Fork Flatwillow Creekriver
- 69McCartney Creekriver
- 69North Fork Flatwillow Creekriver
- 69South Fork Flatwillow Creekriver
- 69South Fork Flatwillow Creekriver
- 69South Fork Flatwillow Creekriver
- 69North Fork Flatwillow Creekriver
- 69Maynard Creekriver