Swan HUC8 17010211
A 1,888 km² sub-basin of the Pacific Northwest 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
77
Healthy
Drought index
100
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 1 reporting
Median flow
89%
p36 of record
Water assets
348
2 springs · 71 wells
USGS gauges (1)
- Swan River near Bigfork, MT12370000450 cfsp36 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 100 | 0 | 0/1 | p36 |
Top water assets
- 69Lion Creekriver
- 69Hemlock Creekriver
- 69Crazy Horse Creekriver
- 69Dog Creekriver
- 69Glacier Creekriver
- 69Dog Creekriver
- 69Kraft Creekriver
- 69Glacier Creekriver
- 69Glacier Creekriver
- 69Crazy Horse Creekriver