USGS Streamgage 12358500
M F Flathead River near West Glacier, MT
M F Flathead River near West Glacier, MT is USGS streamgage 12358500 in Montana, monitoring river discharge in hydrologic subbasin 17010207. It drains a watershed of about 1,125 square miles. Discharge records at this site go back to 1916. Typical flow runs near 3,426.1 cfs in July and 2,832.7 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Montana
- Drainage area
- 1,125 sq mi
- Gauge elevation
- 3,134 ft
- Subbasin (HUC-8)
- 17010207
- Coordinates
- 48.49552, -114.01021
- USGS site number
- 12358500
- Records begin
- 1916-01-01 (110 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 86 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 | 353.7 | 587.4 | 1,179.7 | |
| February | 337.7 | 553.2 | 1,236.9 | |
| March | 402.4 | 719.5 | 1,774.2 | |
| April | 1,209.2 | 2,832.7 | 6,105.3 | |
| May | 4,737.4 | 8,558.4 | 15,716.1 | |
| June | 4,696 | 8,996.3 | 16,263.3 | |
| July | 1,618.4 | 3,426.1 | 6,499 | |
| August | 776.6 | 1,222.4 | 1,931 | |
| September | 508.9 | 764.9 | 1,438.7 | |
| October | 411.6 | 740.5 | 1,950 | |
| November | 411.5 | 845.2 | 2,409 | |
| December | 390 | 693.6 | 1,761.3 |
All values in cubic feet per second (cfs).