Rivermatics

USGS Streamgage 09021000

Willow Creek below Willow Creek Reservoir, CO

Willow Creek below Willow Creek Reservoir, CO is USGS streamgage 09021000 in Colorado, monitoring river discharge in hydrologic subbasin 14010001. It sits on the Willow Creek, alongside 2 other gauges Rivermatics tracks on the same river. It drains a watershed of about 134 square miles. Discharge records at this site go back to 1953. Typical flow runs near 37.4 cfs in July and 7 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
134 sq mi
Gauge elevation
8,040 ft
Subbasin (HUC-8)
14010001
Coordinates
40.14582, -105.94002
USGS site number
09021000
Records begin
1953-08-03 (73 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Willow Creek below Willow Creek Reservoir, 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
17.5 27.4 41.6
12.1 25.2 39.9
9.1 23.3 39
7.7 22.1 40
6.2 20 36.4
6.1 19.9 37.5
5.7 19.7 38.1
5 18 34.7
4.3 17.2 34.9
3.9 16.6 34.8
3.6 16.2 34.9
2.6 14.5 34.8
0.9 11.9 36
1.7 13.1 35.3

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 73 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 6.1 7 7.9
February 6.5 7 8.1
March 6.5 7 10.4
April 6.2 7 42.4
May 2.4 22 472
June 16.5 45.9 283.1
July 13.9 37.4 79.8
August 0.1 6.7 23.1
September 0.1 3.5 10.5
October 6 7.2 12.4
November 6.2 7 9
December 6.2 6.8 9.6

All values in cubic feet per second (cfs).

Common questions

When does Willow Creek below Willow Creek Reservoir, CO normally run highest?
June, on the long-term record. The median daily flow that month is about 45.9 cfs, against 3.5 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 Willow Creek below Willow Creek Reservoir, CO?
It depends on the month. In January, half of days historically fall near 7 cfs, with the middle 80% of days between 6.1 and 7.9 cfs. The month-by-month table on this page gives the full range.
How long has Willow Creek below Willow Creek Reservoir, CO been measured?
Discharge records at USGS site 09021000 begin in 1953, about 73 years, covering roughly 3,059 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Willow Creek below Willow Creek Reservoir, 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 Willow Creek below Willow Creek Reservoir, CO?
The gauge sits at 40.14582, -105.94002, in Colorado, in hydrologic subbasin 14010001, at an elevation of about 8,040 feet, draining roughly 134 square miles.
Can I use Willow Creek below Willow Creek Reservoir, 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.

Upstream and downstream on the Willow Creek

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

Other gauges in this subbasin