Rivermatics

USGS Streamgage 09218500

Blacks Fork near Millburne, WY

Blacks Fork near Millburne, WY is USGS streamgage 09218500 in Wyoming, monitoring river discharge in hydrologic subbasin 14040107. It sits on the Blacks Fork, alongside 5 other gauges Rivermatics tracks on the same river. It drains a watershed of about 146 square miles. Discharge records at this site go back to 1939. Typical flow runs near 316.8 cfs in July and 31.1 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
Wyoming
Drainage area
146 sq mi
Gauge elevation
8,518 ft
Subbasin (HUC-8)
14040107
Coordinates
41.0316, -110.57936
USGS site number
09218500
Records begin
1939-10-01 (87 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Blacks Fork near Millburne, WY. 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
84.9 92.2 99.5
79.2 90.1 99.2
73.4 88 100
67.4 86.4 102
62.5 85 104
57.9 83.6 105
55.5 83.9 110
51.3 81.4 108
50.1 80.3 109
47.6 78.8 109
46.7 78 111
46.7 77.8 113
45.9 76.9 113
43.9 75.6 113

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 86 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 10.8 27.3 43.4
February 10.3 27 37.9
March 9.5 29.1 42.4
April 9.5 31.1 114
May 132.1 331.6 772.9
June 362.9 652.5 1,126.4
July 143.3 316.8 591.2
August 58.9 127.8 249.9
September 38.7 82.4 206.2
October 29.9 44.7 115.3
November 15.7 33.8 62.5
December 11 30.4 45.2

All values in cubic feet per second (cfs).

Common questions

When does Blacks Fork near Millburne, WY normally run highest?
June, on the long-term record. The median daily flow that month is about 652.5 cfs, against 27 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 Blacks Fork near Millburne, WY?
It depends on the month. In January, half of days historically fall near 27.3 cfs, with the middle 80% of days between 10.8 and 43.4 cfs. The month-by-month table on this page gives the full range.
How long has Blacks Fork near Millburne, WY been measured?
Discharge records at USGS site 09218500 begin in 1939, about 87 years, covering roughly 2,665 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Blacks Fork near Millburne, WY?
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 Blacks Fork near Millburne, WY?
The gauge sits at 41.0316, -110.57936, in Wyoming, in hydrologic subbasin 14040107, at an elevation of about 8,518 feet, draining roughly 146 square miles.
Can I use Blacks Fork near Millburne, WY 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 Blacks Fork

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

Other gauges in this subbasin