Rock HUC8 10050015
A 3,545 km² sub-basin of the Missouri region in CN, 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
73
Moderate
Drought index
189
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 1 reporting
Median flow
40%
p35 of record
Water assets
1,032
0 springs · 50 wells
USGS gauges (1)
- Rock Creek bl Horse Creek nr int'l boundary061695000 cfsp35 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 189 | 0 | 0/1 | p35 |
Top water assets
- 67Rock Creekriver
- 67Rock Creekriver
- 67Rock Creekriver
- 67Willow Creekriver
- 67Rock Creekriver
- 67Rock Creekriver
- 67Deep Creekriver
- 67Deep Creekriver
- 67Rock Creek Bl Horse Creek Nr Int'L Boundaryriver
- 67Rock Creekriver