USGS Streamgage 13039500
Henrys Fork near Lake, ID
Henrys Fork near Lake, ID is USGS streamgage 13039500 in Idaho, monitoring river discharge in hydrologic subbasin 17040202. It drains a watershed of about 95 square miles. Discharge records at this site go back to 1920. Typical flow runs near 108.5 cfs in July and 21.4 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Idaho
- Drainage area
- 95 sq mi
- Subbasin (HUC-8)
- 17040202
- Coordinates
- 44.59444, -111.34972
- USGS site number
- 13039500
- Records begin
- 1920-05-01 (106 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 106 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 | 1.4 | 11.8 | 51.8 | |
| February | 1.7 | 14 | 61.4 | |
| March | 1.8 | 15.8 | 64.2 | |
| April | 2 | 21.4 | 88.1 | |
| May | 2.2 | 42.7 | 144.6 | |
| June | 8.6 | 82.7 | 220 | |
| July | 36.9 | 108.5 | 271 | |
| August | 32 | 91.9 | 264.6 | |
| September | 8.6 | 40.6 | 104.9 | |
| October | 2.1 | 14.3 | 59.6 | |
| November | 1.5 | 10.2 | 46.5 | |
| December | 1 | 11.2 | 45.5 |
All values in cubic feet per second (cfs).