USGS Streamgage 12391400
Clark Fork below Noxon Rapids Dam near Noxon, MT
Clark Fork below Noxon Rapids Dam near Noxon, MT is USGS streamgage 12391400 in Montana, monitoring river discharge in hydrologic subbasin 17010213. It drains a watershed of about 21,709 square miles. Discharge records at this site go back to 1960. Typical flow runs near 23,080.6 cfs in July and 21,256.7 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Montana
- Drainage area
- 21,709 sq mi
- Gauge elevation
- 2,262 ft
- Subbasin (HUC-8)
- 17010213
- Coordinates
- 47.96124, -115.73351
- USGS site number
- 12391400
- Records begin
- 1960-06-01 (66 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 55 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 | 7,699 | 13,996.8 | 19,474.2 | |
| February | 7,094.8 | 14,124.1 | 22,265.5 | |
| March | 8,026.1 | 14,838.7 | 23,490.3 | |
| April | 10,539.3 | 21,256.7 | 37,303.3 | |
| May | 20,519.4 | 38,516.1 | 68,145.2 | |
| June | 21,940 | 48,013.3 | 85,453.3 | |
| July | 10,897.1 | 23,080.6 | 36,716.1 | |
| August | 5,417.7 | 10,516.8 | 16,171 | |
| September | 5,098 | 9,743.7 | 15,346.7 | |
| October | 6,173.9 | 11,377.4 | 16,354.8 | |
| November | 7,276.7 | 12,740 | 18,266.7 | |
| December | 8,153.5 | 13,622.6 | 19,348.4 |
All values in cubic feet per second (cfs).