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 sits on the Clark Fork, alongside 12 other gauges Rivermatics tracks on the same river. 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).
Common questions
- When does Clark Fork below Noxon Rapids Dam near Noxon, MT normally run highest?
- June, on the long-term record. The median daily flow that month is about 48,013.3 cfs, against 9,743.7 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Clark Fork below Noxon Rapids Dam near Noxon, MT?
- It depends on the month. In January, half of days historically fall near 13,996.8 cfs, with the middle 80% of days between 7,699 and 19,474.2 cfs. The month-by-month table on this page gives the full range.
- How long has Clark Fork below Noxon Rapids Dam near Noxon, MT been measured?
- Discharge records at USGS site 12391400 begin in 1960, about 66 years, covering roughly 4,872 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Clark Fork below Noxon Rapids Dam near Noxon, MT?
- The gauge sits at 47.96124, -115.73351, in Montana, in hydrologic subbasin 17010213, at an elevation of about 2,262 feet, draining roughly 21,709 square miles.
- Can I use Clark Fork below Noxon Rapids Dam near Noxon, MT data for flood or safety decisions?
- No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.
Upstream and downstream on the Clark Fork
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Clark Fork in full.
- Clark Fork near Galen, MT 656 sq mi
- Clark Fork at Deer Lodge, MT 1,001 sq mi
- Clark Fork ab Little Blackfoot River near Garrison, MT 1,130 sq mi
- Clark Fork at Goldcreek, MT 1,774 sq mi
- Clark Fork near Drummond, MT 2,516 sq mi
- Clark Fork at Turah Bridge near Bonner, MT 3,657 sq mi
- Clark Fork above Missoula, MT 6,021 sq mi
- Clark Fork below Missoula, MT 9,017 sq mi
- Clark Fork at Superior, MT 10,210 sq mi
- Clark Fork near Paradise, MT 10,709 sq mi
- Clark Fork at St. Regis, MT 10,728 sq mi
- Clark Fork near Plains, MT 19,964 sq mi
- Clark Fork below Noxon Rapids Dam near Noxon, MT this page