Rivermatics

USGS Streamgage 13039500

Henrys Fork near Lake, ID

Henrys Fork near Lake, ID is USGS streamgage 13039500 in Idaho, monitoring river discharge in hydrologic subbasin 17040202. It sits on the Henrys Fork, alongside 4 other gauges Rivermatics tracks on the same river. It drains a watershed of about 95 square miles. Discharge records at this site go back to 1920. Typical flow runs near 108.5 cfs in July and 21.4 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
95 sq mi
Subbasin (HUC-8)
17040202
Coordinates
44.59444, -111.34972
USGS site number
13039500
Records begin
1920-05-01 (106 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Henrys Fork near Lake, 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
25.6 74.4 98.9
21.8 73.6 113
17.5 68.8 113
14.8 63.1 111
12.9 58.1 109
12.5 53.4 108
12 49.9 105
11.4 48.6 105
9.3 46 104
8.9 44.2 103
8.5 42.6 102
7.3 35.4 100
5.6 32.8 102
5 34 104

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 1.4 11.8 51.8
February 1.7 14 61.4
March 1.8 15.8 64.2
April 2 21.4 88.1
May 2.2 42.7 144.6
June 8.6 82.7 220
July 36.9 108.5 271
August 32 91.9 264.6
September 8.6 40.6 104.9
October 2.1 14.3 59.6
November 1.5 10.2 46.5
December 1 11.2 45.5

All values in cubic feet per second (cfs).

Common questions

When does Henrys Fork near Lake, ID normally run highest?
July, on the long-term record. The median daily flow that month is about 108.5 cfs, against 10.2 cfs in November, 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 Lake, ID?
It depends on the month. In January, half of days historically fall near 11.8 cfs, with the middle 80% of days between 1.4 and 51.8 cfs. The month-by-month table on this page gives the full range.
How long has Henrys Fork near Lake, ID been measured?
Discharge records at USGS site 13039500 begin in 1920, about 106 years, covering roughly 9,200 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 Lake, 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 Lake, ID?
The gauge sits at 44.59444, -111.34972, in Idaho, in hydrologic subbasin 17040202, draining roughly 95 square miles.
Can I use Henrys Fork near Lake, 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