USGS Streamgage 12359800
S F Flathead River ab Twin C near Hungry Horse, MT
S F Flathead River ab Twin C near Hungry Horse, MT is USGS streamgage 12359800 in Montana, monitoring river discharge in hydrologic subbasin 17010209. It drains a watershed of about 1,159 square miles. Discharge records at this site go back to 1964. Typical flow runs near 2,107.9 cfs in July and 2,188.7 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Montana
- Drainage area
- 1,159 sq mi
- Gauge elevation
- 3,582 ft
- Subbasin (HUC-8)
- 17010209
- Coordinates
- 47.9791, -113.56068
- USGS site number
- 12359800
- Records begin
- 1964-06-08 (62 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 62 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 | 213.5 | 365.1 | 885.1 | |
| February | 240.2 | 381 | 1,018.2 | |
| March | 263.6 | 461.1 | 1,302.2 | |
| April | 827.5 | 2,188.7 | 4,833 | |
| May | 3,578.7 | 6,996.5 | 13,622.6 | |
| June | 3,532 | 7,094 | 13,783.7 | |
| July | 1,048.9 | 2,107.9 | 4,337.4 | |
| August | 425.3 | 650.8 | 1,109.4 | |
| September | 291.2 | 417.4 | 818.6 | |
| October | 275.1 | 417.1 | 953 | |
| November | 292 | 483.9 | 1,197.8 | |
| December | 249 | 399.3 | 1,013.2 |
All values in cubic feet per second (cfs).