Rivermatics

USGS Streamgage 09047700

Keystone Gulch near Dillon, CO

Keystone Gulch near Dillon, CO is USGS streamgage 09047700 in Colorado, monitoring river discharge in hydrologic subbasin 14010002. It drains a watershed of about 9 square miles. Discharge records at this site go back to 1957. Typical flow runs near 8.1 cfs in July and 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.

View live conditions & forecast →

Gauge details

State
Colorado
Drainage area
9 sq mi
Gauge elevation
9,360 ft
Subbasin (HUC-8)
14010002
Coordinates
39.59443, -105.97252
USGS site number
09047700
Records begin
1957-10-01 (69 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Keystone Gulch near Dillon, 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
1.3 1.3 1.4
1.2 1.3 1.4
1.2 1.3 1.5
1.2 1.4 1.5
1.2 1.4 1.6
1.2 1.4 1.8
1.3 1.6 2.3
1.3 1.5 2
1.3 1.5 1.9
1.2 1.4 1.8
1.2 1.4 1.7
1.3 1.5 2.2
1.3 1.5 2.1
1.2 1.5 1.9

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 69 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 1.8 2.3 2.8
February 1.5 2.1 2.6
March 1.5 2 2.7
April 2 3 5.1
May 5.2 10.9 23
June 7.4 20.9 43
July 3.8 8.1 16.4
August 2.7 4.6 7.3
September 2.3 3.4 5
October 2.2 3 4.7
November 2.2 3 4.2
December 2 2.6 3.4

All values in cubic feet per second (cfs).

Common questions

When does Keystone Gulch near Dillon, CO normally run highest?
June, on the long-term record. The median daily flow that month is about 20.9 cfs, against 2 cfs in March, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Keystone Gulch near Dillon, CO?
It depends on the month. In January, half of days historically fall near 2.3 cfs, with the middle 80% of days between 1.8 and 2.8 cfs. The month-by-month table on this page gives the full range.
How long has Keystone Gulch near Dillon, CO been measured?
Discharge records at USGS site 09047700 begin in 1957, about 69 years, covering roughly 9,199 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Keystone Gulch near Dillon, 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 Keystone Gulch near Dillon, CO?
The gauge sits at 39.59443, -105.97252, in Colorado, in hydrologic subbasin 14010002, at an elevation of about 9,360 feet, draining roughly 9 square miles.
Can I use Keystone Gulch near Dillon, 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