Rivermatics

USGS Streamgage 09217900

Blacks Fork near Robertson, WY

Blacks Fork near Robertson, WY is USGS streamgage 09217900 in Utah, 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 126 square miles. Discharge records at this site go back to 1938. Typical flow runs near 210.5 cfs in July and 47.3 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
Utah
Drainage area
126 sq mi
Gauge elevation
8,819 ft
Subbasin (HUC-8)
14040107
Coordinates
40.95903, -110.57972
USGS site number
09217900
Records begin
1938-06-05 (88 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Blacks Fork near Robertson, 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
66.6 69 71.6
63 66.5 69.4
60.1 64.4 68
57.7 62.6 66.9
55.9 61.2 66.1
54.1 60 65.7
52.3 58.8 65
51.6 58 64.5
49 56 62.7
47.7 54.9 62.1
46.2 53.6 61
45.2 52.7 60.6
44.3 51.6 59.4
43.3 50.8 58.8

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 60 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 17.6 24.5 36.5
February 13.4 21.7 32.7
March 10.9 23.6 36.5
April 20.9 47.3 154.9
May 146.2 368.7 796.7
June 266.3 616.5 1,336.3
July 73 210.5 570.7
August 38.6 78.1 187.8
September 32.1 53.6 115.9
October 26.8 48.6 91.3
November 22.6 39.1 59.1
December 20.4 29.4 43.4

All values in cubic feet per second (cfs).

Common questions

When does Blacks Fork near Robertson, WY normally run highest?
June, on the long-term record. The median daily flow that month is about 616.5 cfs, against 21.7 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 Robertson, WY?
It depends on the month. In January, half of days historically fall near 24.5 cfs, with the middle 80% of days between 17.6 and 36.5 cfs. The month-by-month table on this page gives the full range.
How long has Blacks Fork near Robertson, WY been measured?
Discharge records at USGS site 09217900 begin in 1938, about 88 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 Blacks Fork near Robertson, 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 Robertson, WY?
The gauge sits at 40.95903, -110.57972, in Utah, in hydrologic subbasin 14040107, at an elevation of about 8,819 feet, draining roughly 126 square miles.
Can I use Blacks Fork near Robertson, 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