USGS Streamgage 13050500
Henrys Fork at St Anthony, ID
Henrys Fork at St Anthony, ID is USGS streamgage 13050500 in Idaho, monitoring river discharge in hydrologic subbasin 17040203. It drains a watershed of about 1,770 square miles. Discharge records at this site go back to 1919. Typical flow runs near 1,168.7 cfs in July and 2,003 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Idaho
- Drainage area
- 1,770 sq mi
- Subbasin (HUC-8)
- 17040203
- Coordinates
- 43.96694, -111.6725
- USGS site number
- 13050500
- Records begin
- 1919-03-01 (107 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 107 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 | 1,136.5 | 1,550.3 | 2,060.3 | |
| February | 1,166.2 | 1,572.4 | 2,034.8 | |
| March | 1,152.6 | 1,521.6 | 2,041.3 | |
| April | 1,175 | 2,003 | 3,187.7 | |
| May | 1,673.5 | 3,355.5 | 5,942.3 | |
| June | 1,056.8 | 2,603 | 4,989.7 | |
| July | 759.3 | 1,168.7 | 2,192.3 | |
| August | 836.6 | 1,185.2 | 1,725.2 | |
| September | 833.5 | 1,226 | 1,736.3 | |
| October | 815.4 | 1,254.2 | 1,896.5 | |
| November | 1,103 | 1,461.3 | 2,126 | |
| December | 1,130.6 | 1,535.8 | 2,066.1 |
All values in cubic feet per second (cfs).