USGS Streamgage 12340000
Blackfoot River near Bonner, MT
Blackfoot River near Bonner, MT is USGS streamgage 12340000 in Montana, monitoring river discharge in hydrologic subbasin 17010203. It drains a watershed of about 2,287 square miles. Discharge records at this site go back to 1898. Typical flow runs near 1,561.1 cfs in July and 1,814.4 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Montana
- Drainage area
- 2,287 sq mi
- Gauge elevation
- 3,348 ft
- Subbasin (HUC-8)
- 17010203
- Coordinates
- 46.89941, -113.75632
- USGS site number
- 12340000
- Records begin
- 1898-07-01 (128 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 128 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 | 356.6 | 521.5 | 772.5 | |
| February | 395.3 | 539.5 | 826.8 | |
| March | 466.2 | 697.5 | 1,328.5 | |
| April | 818.6 | 1,814.4 | 3,859.3 | |
| May | 2,269 | 4,590.3 | 8,526.8 | |
| June | 1,934.7 | 4,207.3 | 8,570.3 | |
| July | 765.7 | 1,561.1 | 2,942.9 | |
| August | 470.9 | 772.6 | 1,130.2 | |
| September | 415.5 | 636.3 | 883 | |
| October | 434.5 | 607.9 | 872.3 | |
| November | 458.5 | 607.8 | 907.2 | |
| December | 392.2 | 544.5 | 832.1 |
All values in cubic feet per second (cfs).