USGS Streamgage 13075500
Portneuf River at Pocatello, ID
Portneuf River at Pocatello, ID is USGS streamgage 13075500 in Idaho, monitoring river discharge in hydrologic subbasin 17040208. It drains a watershed of about 1,256 square miles. Discharge records at this site go back to 1897. Typical flow runs near 72.7 cfs in July and 451.3 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Idaho
- Drainage area
- 1,256 sq mi
- Subbasin (HUC-8)
- 17040208
- Coordinates
- 42.87167, -112.46806
- USGS site number
- 13075500
- Records begin
- 1897-05-18 (129 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 129 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 | 177.9 | 242.9 | 357.5 | |
| February | 191 | 273.3 | 427.2 | |
| March | 240.6 | 354.9 | 560.5 | |
| April | 242.5 | 451.3 | 847.6 | |
| May | 103.4 | 405.2 | 1,110.5 | |
| June | 52.3 | 169.2 | 636.9 | |
| July | 25.6 | 72.7 | 197 | |
| August | 29.7 | 73.4 | 152.5 | |
| September | 47.5 | 98.3 | 216 | |
| October | 91.5 | 174.3 | 314.6 | |
| November | 156.2 | 243.4 | 336.9 | |
| December | 177.1 | 242.5 | 333.8 |
All values in cubic feet per second (cfs).