USGS Streamgage 13172454
Snake River below Swan Falls Dam, ID
Snake River below Swan Falls Dam, ID is USGS streamgage 13172454 in Idaho, monitoring river discharge in hydrologic subbasin 17050103. It drains a watershed of about 41,900 square miles. Discharge records at this site go back to 2016. Typical flow runs near 7,284.8 cfs in July and 10,847.3 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Idaho
- Drainage area
- 41,900 sq mi
- Subbasin (HUC-8)
- 17050103
- Coordinates
- 43.24937, -116.38381
- USGS site number
- 13172454
- Records begin
- 2016-10-01 (10 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 9 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 | 6,306.8 | 6,773.5 | 13,977.4 | |
| February | 6,091.4 | 6,707.2 | 14,278.6 | |
| March | 6,067.7 | 7,607.1 | 23,471 | |
| April | 5,905.3 | 10,847.3 | 27,436.7 | |
| May | 6,051.9 | 9,883.2 | 21,571 | |
| June | 5,011 | 8,050 | 16,833 | |
| July | 4,403.2 | 7,284.8 | 10,376.1 | |
| August | 4,750 | 6,050.3 | 8,075.5 | |
| September | 5,868.3 | 6,823 | 7,779 | |
| October | 6,449 | 7,711.9 | 8,857.4 | |
| November | 6,492.3 | 7,135.3 | 8,993.3 | |
| December | 6,413.2 | 6,963.9 | 12,035.8 |
All values in cubic feet per second (cfs).