Flathead Lake HUC8 17010208
A 3,084 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
74
Moderate
Drought index
100
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 1 reporting
Median flow
109%
p55 of record
Water assets
934
7 springs · 661 wells
USGS gauges (1)
- Flathead River at Columbia Falls MT123630004,420 cfsp55 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 100 | 0 | 0/1 | p55 |
Top water assets
- 69Parker Creekriver
- 69Yellow Bay Creekriver
- 67Wild Bill Creekriver
- 67Selis Ksanka Qlispe (Skq)reservoir
- 67Ashley Creekriver
- 67Flathead Riverriver
- 67Patrick Creekriver
- 67Flathead River At Columbia Falls Mtriver
- 67Abbot Creekriver
- 67Big Lost Creekriver