USGS Streamgage 13306000
NF Salmon River at North Fork, ID
NF Salmon River at North Fork, ID is USGS streamgage 13306000 in Idaho, monitoring river discharge in hydrologic subbasin 17060203. It drains a watershed of about 211 square miles. Discharge records at this site go back to 1929. Typical flow runs near 77.8 cfs in July and 100 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Idaho
- Drainage area
- 211 sq mi
- Subbasin (HUC-8)
- 17060203
- Coordinates
- 45.4075, -113.99306
- USGS site number
- 13306000
- Records begin
- 1929-10-01 (97 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 11 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 | 27.3 | 33.4 | 48.5 | |
| February | 29.1 | 34 | 46.4 | |
| March | 31.1 | 40 | 86.5 | |
| April | 45.9 | 100 | 311.6 | |
| May | 155.5 | 265 | 572.2 | |
| June | 99.8 | 226.6 | 587.8 | |
| July | 36.5 | 77.8 | 124.1 | |
| August | 22.1 | 39.4 | 52.2 | |
| September | 22.9 | 34.3 | 47 | |
| October | 28.5 | 39.2 | 50 | |
| November | 30.8 | 41.5 | 52.5 | |
| December | 26 | 37.5 | 52.1 |
All values in cubic feet per second (cfs).
Common questions
- When does NF Salmon River at North Fork, ID normally run highest?
- May, on the long-term record. The median daily flow that month is about 265 cfs, against 33.4 cfs in January, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for NF Salmon River at North Fork, ID?
- It depends on the month. In January, half of days historically fall near 33.4 cfs, with the middle 80% of days between 27.3 and 48.5 cfs. The month-by-month table on this page gives the full range.
- How long has NF Salmon River at North Fork, ID been measured?
- Discharge records at USGS site 13306000 begin in 1929, about 97 years, covering roughly 68 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is NF Salmon River at North Fork, ID?
- The gauge sits at 45.4075, -113.99306, in Idaho, in hydrologic subbasin 17060203, draining roughly 211 square miles.
- Can I use NF Salmon River at North Fork, ID 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.