USGS Streamgage 13136000
Big Wood River at Ketchum, ID
Big Wood River at Ketchum, ID is USGS streamgage 13136000 in Idaho, monitoring river discharge in hydrologic subbasin 17040219. It sits on the Big Wood River, alongside 7 other gauges Rivermatics tracks on the same river. It drains a watershed of about 240 square miles. Discharge records at this site go back to 1920. Typical flow runs near 401.3 cfs in July and 267.3 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Idaho
- Drainage area
- 240 sq mi
- Subbasin (HUC-8)
- 17040219
- Coordinates
- 43.68861, -114.37333
- USGS site number
- 13136000
- Records begin
- 1920-05-06 (106 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 2 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
Only 8 of 12 months have enough record to summarize; the rest are omitted.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| April | — | 267.3 | — | |
| May | — | 784.4 | — | |
| June | — | 1,037.9 | — | |
| July | — | 401.3 | — | |
| August | — | 163.8 | — | |
| September | — | 129.4 | — | |
| October | — | 107.8 | — | |
| November | — | 85 | — |
All values in cubic feet per second (cfs).
Common questions
- When does Big Wood River at Ketchum, ID normally run highest?
- June, on the long-term record. The median daily flow that month is about 1,037.9 cfs, against 85 cfs in November, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- How long has Big Wood River at Ketchum, ID been measured?
- Discharge records at USGS site 13136000 begin in 1920, about 106 years. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Big Wood River at Ketchum, ID?
- The gauge sits at 43.68861, -114.37333, in Idaho, in hydrologic subbasin 17040219, draining roughly 240 square miles.
- Can I use Big Wood River at Ketchum, 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 Big Wood River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Big Wood River in full.
- Big Wood River near Ketchum, ID 137 sq mi
- Big Wood River at Ketchum, ID this page
- Big Wood River at Gimlet, ID 517 sq mi
- Big Wood River at Hailey Id Total Flow 614 sq mi
- Big Wood River at Glendale Bridge near Bellevue, ID 665 sq mi
- Big Wood River at S Broadford Bridge near Bellevue, ID 695 sq mi
- Big Wood River at Stanton Crossing near Bellevue, ID 748 sq mi
- Big Wood River below Magic Dam near Richfield, ID 1,611 sq mi
Other gauges in this subbasin
- Warm Springs Creek at Gates Rd near Ketchum, ID
- Trail Creek near Sun Valley, ID
- Trail Creek at Ketchum, ID
- East Fork Big Wood River at Gimlet, ID
- Big Wood River at Gimlet, ID
- Big Wood River at Hailey Id Total Flow
- Big Wood River at S Broadford Bridge near Bellevue, ID
- Big Wood River at Glendale Bridge near Bellevue, ID