USGS Streamgage 12372000
Flathead River near Polson, MT
Flathead River near Polson, MT is USGS streamgage 12372000 in Montana, monitoring river discharge in hydrologic subbasin 17010212. It drains a watershed of about 7,079 square miles. Discharge records at this site go back to 1894. Typical flow runs near 12,643.9 cfs in July and 9,233 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Montana
- Drainage area
- 7,079 sq mi
- Gauge elevation
- 2,698 ft
- Subbasin (HUC-8)
- 17010212
- Coordinates
- 47.68029, -114.24673
- USGS site number
- 12372000
- Records begin
- 1894-06-01 (132 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 87 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 5,664.5 | 9,990.6 | 13,619.4 | |
| February | 5,143.8 | 8,985.9 | 14,131 | |
| March | 4,056.1 | 7,591.6 | 13,241.9 | |
| April | 4,311 | 9,233 | 18,113.3 | |
| May | 8,449.4 | 18,861.3 | 36,083.9 | |
| June | 11,962.3 | 24,493.3 | 46,226.7 | |
| July | 6,126.5 | 12,643.9 | 22,858.1 | |
| August | 3,501.3 | 5,957.7 | 9,727.4 | |
| September | 3,408.7 | 5,707 | 10,064.7 | |
| October | 4,007.7 | 7,076.1 | 11,203.2 | |
| November | 4,230.7 | 8,115.7 | 12,230 | |
| December | 5,692.9 | 9,756.5 | 13,454.8 |
All values in cubic feet per second (cfs).