Rivermatics

USGS Streamgage 09209400

Green River near La Barge, WY

Green River near La Barge, WY is USGS streamgage 09209400 in Wyoming, monitoring river discharge in hydrologic subbasin 14040101. It sits on the Green River, alongside 8 other gauges Rivermatics tracks on the same river. It drains a watershed of about 3,825 square miles. Discharge records at this site go back to 1947. Typical flow runs near 2,574.5 cfs in July and 1,266.5 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.

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Gauge details

State
Wyoming
Drainage area
3,825 sq mi
Gauge elevation
6,532 ft
Subbasin (HUC-8)
14040101
Coordinates
42.1927, -110.16325
USGS site number
09209400
Records begin
1947-06-22 (79 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Green River near La Barge, 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
510 546 578
481 527 572
454 508 569
436 496 561
419 484 557
404 473 552
405 482 582
412 501 618
404 496 618
396 489 618
381 475 605
372 469 602
361 458 592
351 449 582

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 63 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 331.8 436.8 579.9
February 352.7 466.1 619.1
March 463.6 647.6 1,123.4
April 674.7 1,266.5 2,233
May 894.5 2,510.3 5,146.5
June 1,835.3 4,579.7 10,111.7
July 927.6 2,574.5 6,031.9
August 533.6 1,087.8 2,205.8
September 403.7 690 1,334
October 471.8 702.9 1,213.2
November 475.8 685.9 1,006.7
December 372 497.2 667.9

All values in cubic feet per second (cfs).

Common questions

When does Green River near La Barge, WY normally run highest?
June, on the long-term record. The median daily flow that month is about 4,579.7 cfs, against 436.8 cfs in January, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Green River near La Barge, WY?
It depends on the month. In January, half of days historically fall near 436.8 cfs, with the middle 80% of days between 331.8 and 579.9 cfs. The month-by-month table on this page gives the full range.
How long has Green River near La Barge, WY been measured?
Discharge records at USGS site 09209400 begin in 1947, about 79 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 Green River near La Barge, 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 Green River near La Barge, WY?
The gauge sits at 42.1927, -110.16325, in Wyoming, in hydrologic subbasin 14040101, at an elevation of about 6,532 feet, draining roughly 3,825 square miles.
Can I use Green River near La Barge, 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 Green River

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

Other gauges in this subbasin