Big Porcupine HUC8 10100002
A 2,260 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
57
Moderate
Drought index
209
Severe
Area in D2+
8.95%
0% exceptional (D4)
Gauges below normal
—
no gauges reporting
Median flow
—
of normal for the date
Water assets
317
0 springs · 14 wells
USGS gauges (0)
No active discharge gauges in this sub-basin.
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 209 | 8.95 | — | — |
Top water assets
- 67Big Porcupine Creekriver
- 67Big Porcupine Creekriver
- 67West Blacktail Creekriver
- 67Big Porcupine Creekriver
- 67Montana #19reservoir
- 67West Blacktail Creekriver
- 67Big Porcupine Creekriver
- 67Big Porcupine Creekriver
- 67Big Porcupine Creekriver
- 67Big Porcupine Creekriver