Rivermatics

USGS Streamgage 13137500

Trail Creek at Ketchum, ID

Trail Creek at Ketchum, ID is USGS streamgage 13137500 in Idaho, monitoring river discharge in hydrologic subbasin 17040219. It sits on the Trail Creek, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 64 square miles. Discharge records at this site go back to 1920. Typical flow runs near 37.8 cfs in July and 23.2 cfs in April, with the higher of the two arriving in July. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.

View live conditions & forecast →

Gauge details

State
Idaho
Drainage area
64 sq mi
Subbasin (HUC-8)
17040219
Coordinates
43.67422, -114.36226
USGS site number
13137500
Records begin
1920-07-20 (106 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Trail Creek at Ketchum, ID. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.

Forecast daily mean discharge in cubic feet per second, by date
Date Low p10 Expected p50 High p90 Range
3.9 4.4 4.8
3.5 4.2 4.8
3.3 4.1 4.8
3.2 4 4.9
3.1 4 4.9
3.1 4.1 5.4
3.1 4.4 6.2
3 4.2 5.9
2.9 4.1 5.7
2.8 4 5.6
2.6 3.8 5.4
2.5 3.7 5.4
2.4 3.6 5.3
2.3 3.6 5.3

All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 106 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 2.9 7.2 14.9
February 3.1 9.3 16.1
March 5.9 12.5 25.6
April 10.5 23.2 70.5
May 29.5 85.3 233
June 57.8 144.5 402
July 12.4 37.8 179.2
August 3.4 9.1 38.6
September 1.7 7.1 22.4
October 6.4 11.1 27.1
November 7.2 13.1 25.7
December 3.4 10.1 18.7

All values in cubic feet per second (cfs).

Common questions

When does Trail Creek at Ketchum, ID normally run highest?
June, on the long-term record. The median daily flow that month is about 144.5 cfs, against 7.1 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Trail Creek at Ketchum, ID?
It depends on the month. In January, half of days historically fall near 7.2 cfs, with the middle 80% of days between 2.9 and 14.9 cfs. The month-by-month table on this page gives the full range.
How long has Trail Creek at Ketchum, ID been measured?
Discharge records at USGS site 13137500 begin in 1920, about 106 years, covering roughly 5,740 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Trail Creek at Ketchum, ID?
Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
Where is Trail Creek at Ketchum, ID?
The gauge sits at 43.67422, -114.36226, in Idaho, in hydrologic subbasin 17040219, draining roughly 64 square miles.
Can I use Trail Creek 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 Trail Creek

Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Trail Creek in full.

Other gauges in this subbasin