Rivermatics

USGS Streamgage 09035900

South Fork of Williams Fork near Leal, CO

South Fork of Williams Fork near Leal, CO is USGS streamgage 09035900 in Colorado, monitoring river discharge in hydrologic subbasin 14010001. It drains a watershed of about 27 square miles. Discharge records at this site go back to 1965. Typical flow runs near 59 cfs in July and 12 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
Colorado
Drainage area
27 sq mi
Gauge elevation
8,957 ft
Subbasin (HUC-8)
14010001
Coordinates
39.79582, -106.03057
USGS site number
09035900
Records begin
1965-10-01 (61 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for South Fork of Williams Fork near Leal, CO. 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
5 5.3 5.6
4.9 5.2 5.6
4.7 5.1 5.5
5.1 5.9 8.1
5.2 6.1 8.6
5.5 6.9 10.8
5.7 7.3 11.6
5.5 6.8 9.7
5.2 6.2 8.2
5 6 7.8
4.8 5.8 7.3
4.7 5.6 7.1
4.6 5.5 7
4.5 5.4 6.9

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 61 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 5.9 8.1 10.2
February 5.7 7.6 9.6
March 5.8 7.8 10.3
April 6.7 12 21.3
May 26.5 54.7 104.8
June 76.2 148 250.7
July 27.6 59 122.8
August 14.5 23.4 38.4
September 10.7 15.1 22.6
October 9.6 12.9 17.9
November 7.8 11 15.2
December 6.5 9.2 12.4

All values in cubic feet per second (cfs).

Common questions

When does South Fork of Williams Fork near Leal, CO normally run highest?
June, on the long-term record. The median daily flow that month is about 148 cfs, against 7.6 cfs in February, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for South Fork of Williams Fork near Leal, CO?
It depends on the month. In January, half of days historically fall near 8.1 cfs, with the middle 80% of days between 5.9 and 10.2 cfs. The month-by-month table on this page gives the full range.
How long has South Fork of Williams Fork near Leal, CO been measured?
Discharge records at USGS site 09035900 begin in 1965, about 61 years, covering roughly 9,186 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for South Fork of Williams Fork near Leal, CO?
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 South Fork of Williams Fork near Leal, CO?
The gauge sits at 39.79582, -106.03057, in Colorado, in hydrologic subbasin 14010001, at an elevation of about 8,957 feet, draining roughly 27 square miles.
Can I use South Fork of Williams Fork near Leal, CO 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.

Other gauges in this subbasin