USGS Streamgage 13042500
Henrys Fork near Island Park, ID
Henrys Fork near Island Park, ID is USGS streamgage 13042500 in Idaho, monitoring river discharge in hydrologic subbasin 17040202. It drains a watershed of about 501 square miles. Discharge records at this site go back to 1933. Typical flow runs near 1,140.6 cfs in July and 475.7 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Idaho
- Drainage area
- 501 sq mi
- Subbasin (HUC-8)
- 17040202
- Coordinates
- 44.41667, -111.39472
- USGS site number
- 13042500
- Records begin
- 1933-01-07 (93 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 93 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 | 8.7 | 289.9 | 579.1 | |
| February | 13.6 | 323.7 | 580.2 | |
| March | 45.6 | 338.7 | 566.7 | |
| April | 171.7 | 475.7 | 799.6 | |
| May | 450 | 872.8 | 1,602.6 | |
| June | 519.3 | 897.6 | 1,512.7 | |
| July | 657.2 | 1,140.6 | 1,668.4 | |
| August | 644.5 | 1,053.1 | 1,469 | |
| September | 373.4 | 661.7 | 1,041.5 | |
| October | 112.3 | 398.4 | 642.3 | |
| November | 43.1 | 251.1 | 622.8 | |
| December | 7.7 | 287.7 | 576.5 |
All values in cubic feet per second (cfs).