USGS Streamgage 13032500
Snake River near Irwin, ID
Snake River near Irwin, ID is USGS streamgage 13032500 in Idaho, monitoring river discharge in hydrologic subbasin 17040104. It drains a watershed of about 5,225 square miles. Discharge records at this site go back to 1934. Typical flow runs near 12,616.1 cfs in July and 4,714.3 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Idaho
- Drainage area
- 5,225 sq mi
- Subbasin (HUC-8)
- 17040104
- Coordinates
- 43.35083, -111.21889
- USGS site number
- 13032500
- Records begin
- 1934-05-09 (92 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 91 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 | 905.6 | 1,528.1 | 3,477.1 | |
| February | 888.4 | 1,529.3 | 4,096.6 | |
| March | 895.3 | 1,884.2 | 8,413.2 | |
| April | 1,437.9 | 4,714.3 | 14,176.7 | |
| May | 7,009 | 11,580 | 17,541.9 | |
| June | 9,927 | 13,366.7 | 21,250 | |
| July | 10,266.8 | 12,616.1 | 16,445.2 | |
| August | 7,250.6 | 9,156.5 | 11,264.5 | |
| September | 4,541 | 6,856 | 8,757 | |
| October | 1,887.7 | 3,259 | 4,747.7 | |
| November | 891.3 | 1,634 | 3,339 | |
| December | 902.3 | 1,446.8 | 3,539.4 |
All values in cubic feet per second (cfs).