O'Fallon HUC8 10100005
A 4,092 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
41
Stressed
Drought index
351
Extreme
Area in D2+
100%
0% exceptional (D4)
Gauges below normal
—
no gauges reporting
Median flow
—
of normal for the date
Water assets
940
1 springs · 401 wells
USGS gauges (0)
No active discharge gauges in this sub-basin.
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 351 | 100 | — | — |
Top water assets
- 67Whitney Creekriver
- 67Pennel Creekriver
- 67Lame Jones Creekriver
- 67Pennel Creekriver
- 67O'Fallon Creekriver
- 67Shumaker #1reservoir
- 67O'Fallon Creekriver
- 67Pine Creekriver
- 67Whitney Creekriver
- 67Pennel Creekriver