Total streamflow across the
Flathead River
was last observed at
20,330
cfs, and is expected to yield approximately
40,324
acre-ft of water today; about 86%
of normal.
Average streamflow for this time of year is
23,747 cfs,
with recent peaks last observed
on
2012-06-27 when daily discharge volume was observed at
165,650 cfs.
Maximum discharge along the river is currently at the
Flathead River At Perma Mt
reporting a streamflow rate of 8,540 cfs.
This is also the highest stage along the Flathead River, with a gauge stage of
8.93 ft at this location.
This river is monitored from 4 different streamgauging stations along the Flathead River, the highest being situated at an altitude of 3,983 ft, the
Flathead River At Flathead British Columbia.
| Last Updated | 2025-12-04 |
| Discharge Volume | 40,324 ACRE-FT |
| Streamflow |
20,330.0 cfs
-493.0 cfs (-2.37%) |
| Percent of Normal | 85.61% |
| Maximum |
165,650.0 cfs
2012-06-27 |
| Seasonal Avg | 23,747 cfs |
| Streamgauge | Streamflow | Gauge Stage | 24hr Change (%) | % Normal | Minimum (cfs) | Maximum (cfs) | Air Temp | Elevation |
|---|---|---|---|---|---|---|---|---|
|
Flathead River At Flathead British Columbia
USGS 12355000 |
463 cfs | 4.73 ft | -4.34 | |||||
|
Flathead River At Columbia Falls Mt
USGS 12363000 |
3580 cfs | 3.76 ft | -2.19 | |||||
|
Flathead River Near Polson Mt
USGS 12372000 |
8210 cfs | 5.88 ft | 0 | |||||
|
Flathead River At Perma Mt
USGS 12388700 |
8540 cfs | 8.93 ft | 0.59 |
The Flathead River (Salish: ntx̣ʷetkʷ, ntx̣ʷe ), in the northwestern part of the U.S. state of Montana, originates in the Canadian Rockies to the north of Glacier National Park and flows southwest into Flathead Lake, then after a journey of 158 miles (254 km), empties into the Clark Fork. The river is part of the Columbia River drainage basin, as the Clark Fork is a tributary of the Pend Oreille River, a Columbia River tributary. With a drainage basin extending over 8,795 square miles (22,780 km2) and an average discharge of 11,380 cubic feet per second (322 m3/s), the Flathead is the largest tributary of the Clark Fork and constitutes over half of its flow.