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 sits on the Snake River, alongside 30 other gauges Rivermatics tracks on the same river. 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).
Common questions
- When does Snake River below Swan Falls Dam, ID normally run highest?
- April, on the long-term record. The median daily flow that month is about 10,847.3 cfs, against 6,050.3 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 Swan Falls Dam, ID?
- It depends on the month. In January, half of days historically fall near 6,773.5 cfs, with the middle 80% of days between 6,306.8 and 13,977.4 cfs. The month-by-month table on this page gives the full range.
- How long has Snake River below Swan Falls Dam, ID been measured?
- Discharge records at USGS site 13172454 begin in 2016, about 10 years, covering roughly 3,322 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Snake River below Swan Falls Dam, ID?
- The gauge sits at 43.24937, -116.38381, in Idaho, in hydrologic subbasin 17050103, draining roughly 41,900 square miles.
- Can I use Snake River below Swan Falls Dam, 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.
Upstream and downstream on the Snake River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Snake River in full.
- Snake River Ab Jackson Lake at Flagg Ranch, WY 486 sq mi
- Snake River near Moran, WY 807 sq mi
- Snake River at Moose, WY 1,674 sq mi
- Snake River below Flat Creek, near Jackson, WY 2,672 sq mi
- Snake River above Reservoir, near Alpine, WY 3,465 sq mi
- Snake River near Irwin, ID 5,225 sq mi
- Snake River near Heise, ID 5,752 sq mi
- Snake River at Lorenzo, ID 5,810 sq mi
- Snake River Ab Eagle Rock near Idaho Falls, ID 9,533 sq mi
- Snake River near Shelley, ID 9,790 sq mi
- Snake River at Blackfoot, ID 9,950 sq mi
- Snake River near Blackfoot, ID 11,310 sq mi
- Snake River at Neeley, ID 13,600 sq mi
- Snake River near Minidoka Id at Howells Ferry 15,700 sq mi
- Snake River near Kimberly, ID 22,340 sq mi
- Snake River near Twin Falls, ID 22,360 sq mi
- Snake River at Pigeon Cove near Twin Falls, ID 22,830 sq mi
- Snake River near Buhl, ID 22,990 sq mi
- Snake River below Lower Salmon Falls near Hagerman, ID 26,070 sq mi
- Snake River below Bliss Dam near Bliss, ID 35,500 sq mi
- Snake River at King Hill, ID 35,800 sq mi
- Snake River below Swan Falls Dam, ID this page
- Snake River near Murphy, ID 41,900 sq mi
- Snake River at Nyssa, OR 58,700 sq mi
- Snake River at Weiser, ID 69,200 sq mi
- Snake River at Hells Canyon Dam Id-Or State Line 73,300 sq mi
- Snake River at Johnson Bar Id-Or State Line 73,400 sq mi
- Snake River near Anatone, WA 92,960 sq mi
- Snake River at McDuff Rapids at China Garden, ID
- Snake River near Menan, ID
- Snake River near Powers, WA