USGS Streamgage 13046000
Henrys Fork near Ashton, ID
Henrys Fork near Ashton, ID is USGS streamgage 13046000 in Idaho, monitoring river discharge in hydrologic subbasin 17040203. It drains a watershed of about 1,097 square miles. Discharge records at this site go back to 1890. Typical flow runs near 1,963.2 cfs in July and 1,541.3 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Idaho
- Drainage area
- 1,097 sq mi
- Subbasin (HUC-8)
- 17040203
- Coordinates
- 44.06972, -111.51056
- USGS site number
- 13046000
- Records begin
- 1890-04-01 (136 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 103 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 | 669.3 | 999.6 | 1,457.4 | |
| February | 705.1 | 1,045.9 | 1,418.3 | |
| March | 771.8 | 1,093.5 | 1,452.9 | |
| April | 1,062 | 1,541.3 | 2,275 | |
| May | 1,451.6 | 2,340.3 | 3,941.3 | |
| June | 1,332.7 | 1,904.7 | 3,080.3 | |
| July | 1,356.5 | 1,963.2 | 2,473.5 | |
| August | 1,312.9 | 1,868.1 | 2,363.2 | |
| September | 1,052.6 | 1,456 | 1,935.3 | |
| October | 829.5 | 1,154.2 | 1,566.1 | |
| November | 726 | 1,015.5 | 1,553 | |
| December | 692.3 | 1,004.8 | 1,479 |
All values in cubic feet per second (cfs).