Rivermatics

USGS Streamgage 13046000

Henrys Fork near Ashton, ID

Henrys Fork near Ashton, ID is USGS streamgage 13046000 in Idaho, monitoring river discharge in hydrologic subbasin 17040203. It sits on the Henrys Fork, alongside 4 other gauges Rivermatics tracks on the same river. It drains a watershed of about 1,097 square miles. Discharge records at this site go back to 1890. Typical flow runs near 1,963.2 cfs in July and 1,541.3 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.

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Gauge details

State
Idaho
Drainage area
1,097 sq mi
Subbasin (HUC-8)
17040203
Coordinates
44.06972, -111.51056
USGS site number
13046000
Records begin
1890-04-01 (136 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Henrys Fork near Ashton, 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
1,611 1,662 1,698
1,564 1,652 1,719
1,527 1,648 1,738
1,481 1,644 1,752
1,449 1,637 1,764
1,411 1,626 1,769
1,372 1,613 1,769
1,352 1,606 1,775
1,316 1,590 1,772
1,298 1,581 1,772
1,287 1,576 1,778
1,268 1,568 1,778
1,271 1,569 1,786
1,241 1,553 1,777

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 103 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 669.3 999.6 1,457.4
February 705.1 1,045.9 1,418.3
March 771.8 1,093.5 1,452.9
April 1,062 1,541.3 2,275
May 1,451.6 2,340.3 3,941.3
June 1,332.7 1,904.7 3,080.3
July 1,356.5 1,963.2 2,473.5
August 1,312.9 1,868.1 2,363.2
September 1,052.6 1,456 1,935.3
October 829.5 1,154.2 1,566.1
November 726 1,015.5 1,553
December 692.3 1,004.8 1,479

All values in cubic feet per second (cfs).

Common questions

When does Henrys Fork near Ashton, ID normally run highest?
May, on the long-term record. The median daily flow that month is about 2,340.3 cfs, against 999.6 cfs in January, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Henrys Fork near Ashton, ID?
It depends on the month. In January, half of days historically fall near 999.6 cfs, with the middle 80% of days between 669.3 and 1,457.4 cfs. The month-by-month table on this page gives the full range.
How long has Henrys Fork near Ashton, ID been measured?
Discharge records at USGS site 13046000 begin in 1890, about 136 years, covering roughly 9,201 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Henrys Fork near Ashton, 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 Henrys Fork near Ashton, ID?
The gauge sits at 44.06972, -111.51056, in Idaho, in hydrologic subbasin 17040203, draining roughly 1,097 square miles.
Can I use Henrys Fork near Ashton, 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 Henrys Fork

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

Other gauges in this subbasin