USGS Streamgage 12389000
Clark Fork near Plains, MT
Clark Fork near Plains, MT is USGS streamgage 12389000 in Montana, monitoring river discharge in hydrologic subbasin 17010213. It drains a watershed of about 19,964 square miles. Discharge records at this site go back to 1910. Typical flow runs near 22,787.1 cfs in July and 17,753.3 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Montana
- Drainage area
- 19,964 sq mi
- Gauge elevation
- 2,456 ft
- Subbasin (HUC-8)
- 17010213
- Coordinates
- 47.4292, -114.85653
- USGS site number
- 12389000
- Records begin
- 1910-10-01 (116 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 116 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 | 6,033.9 | 12,180.6 | 17,754.8 | |
| February | 5,995.2 | 11,444.8 | 18,451.7 | |
| March | 6,366.1 | 11,080.6 | 18,574.2 | |
| April | 9,455 | 17,753.3 | 32,396.7 | |
| May | 21,916.1 | 41,148.4 | 69,532.3 | |
| June | 24,193.3 | 49,980 | 86,023.3 | |
| July | 11,858.7 | 22,787.1 | 40,838.7 | |
| August | 6,532.9 | 10,110 | 15,774.2 | |
| September | 5,904 | 8,913.7 | 13,783.3 | |
| October | 6,360.6 | 9,874.5 | 15,209.7 | |
| November | 6,584 | 11,010 | 16,620 | |
| December | 6,354.5 | 12,151.6 | 17,612.9 |
All values in cubic feet per second (cfs).