USGS Streamgage 12362500
S F Flathead River near Columbia Falls, MT
S F Flathead River near Columbia Falls, MT is USGS streamgage 12362500 in Montana, monitoring river discharge in hydrologic subbasin 17010209. It drains a watershed of about 1,668 square miles. Discharge records at this site go back to 1911. Typical flow runs near 2,974.5 cfs in July and 3,801.3 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Montana
- Drainage area
- 1,668 sq mi
- Gauge elevation
- 3,048 ft
- Subbasin (HUC-8)
- 17010209
- Coordinates
- 48.35658, -114.03786
- USGS site number
- 12362500
- Records begin
- 1911-02-01 (115 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 115 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 | 423.2 | 2,407.1 | 8,711.3 | |
| February | 384.5 | 2,371.7 | 8,302.8 | |
| March | 358.9 | 1,906.8 | 8,505.5 | |
| April | 212.4 | 3,801.3 | 10,983.3 | |
| May | 208.1 | 4,803.5 | 14,438.7 | |
| June | 205.6 | 4,337.7 | 13,460 | |
| July | 374.5 | 2,974.5 | 6,805.2 | |
| August | 477.1 | 1,605.8 | 5,796.5 | |
| September | 430.8 | 1,779.3 | 6,474.7 | |
| October | 414 | 1,774.8 | 6,707.4 | |
| November | 391.8 | 1,720 | 6,000.7 | |
| December | 447.9 | 2,222.3 | 8,738.1 |
All values in cubic feet per second (cfs).