USGS Streamgage 13171620
Snake River below Cj Strike Dam near Grand View, ID
Snake River below Cj Strike Dam near Grand View, ID is USGS streamgage 13171620 in Idaho, monitoring river discharge in hydrologic subbasin 17050103. It drains a watershed of about 40,800 square miles. Discharge records at this site go back to 1985. Typical flow runs near 6,454.5 cfs in July and 7,361 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Idaho
- Drainage area
- 40,800 sq mi
- Subbasin (HUC-8)
- 17050103
- Coordinates
- 42.94712, -115.9812
- USGS site number
- 13171620
- Records begin
- 1985-04-01 (41 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 41 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 | 6,435.2 | 7,572.3 | 14,500 | |
| February | 6,378.3 | 7,682.8 | 14,986.2 | |
| March | 6,153.9 | 7,577.4 | 21,600 | |
| April | 5,711.3 | 7,361 | 23,953.3 | |
| May | 5,717.7 | 7,809 | 21,212.9 | |
| June | 4,797.7 | 6,856.7 | 20,156.7 | |
| July | 4,505.2 | 6,454.5 | 9,231.3 | |
| August | 4,887.4 | 6,220.3 | 8,245.8 | |
| September | 5,916.3 | 6,961.3 | 9,813.3 | |
| October | 6,579.4 | 7,781.3 | 11,190 | |
| November | 6,523.3 | 7,458.3 | 12,163.3 | |
| December | 6,396.1 | 7,356.8 | 13,171 |
All values in cubic feet per second (cfs).
Common questions
- When does Snake River below Cj Strike Dam near Grand View, ID normally run highest?
- May, on the long-term record. The median daily flow that month is about 7,809 cfs, against 6,220.3 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Snake River below Cj Strike Dam near Grand View, ID?
- It depends on the month. In January, half of days historically fall near 7,572.3 cfs, with the middle 80% of days between 6,435.2 and 14,500 cfs. The month-by-month table on this page gives the full range.
- How long has Snake River below Cj Strike Dam near Grand View, ID been measured?
- Discharge records at USGS site 13171620 begin in 1985, about 41 years, covering roughly 8,914 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Snake River below Cj Strike Dam near Grand View, ID?
- The gauge sits at 42.94712, -115.9812, in Idaho, in hydrologic subbasin 17050103, draining roughly 40,800 square miles.
- Can I use Snake River below Cj Strike Dam near Grand View, ID data for flood or safety decisions?
- No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.