Rivermatics

USGS Streamgage 06295000

Yellowstone River at Forsyth, MT

Yellowstone River at Forsyth, MT is USGS streamgage 06295000 in Montana, monitoring river discharge in hydrologic subbasin 10100001. It sits on the Yellowstone River, alongside 9 other gauges Rivermatics tracks on the same river. It drains a watershed of about 40,152 square miles. Discharge records at this site go back to 1921. Typical flow runs near 15,554.2 cfs in July and 7,204 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
Montana
Drainage area
40,152 sq mi
Gauge elevation
2,512 ft
Subbasin (HUC-8)
10100001
Coordinates
46.26664, -106.6913
USGS site number
06295000
Records begin
1921-05-15 (105 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Yellowstone River at Forsyth, MT. 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
3,572 3,808 4,055
3,421 3,739 4,070
3,309 3,690 4,116
3,244 3,670 4,181
3,191 3,652 4,220
3,152 3,653 4,284
3,194 3,733 4,496
3,194 3,831 4,788
3,160 3,870 4,989
3,126 3,879 5,132
3,090 3,883 5,274
3,059 3,869 5,329
3,045 3,854 5,325
3,007 3,841 5,379

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 49 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 4,001.6 5,467.4 7,152.3
February 3,862.8 5,480.3 7,881.4
March 4,139 6,066.1 11,104.8
April 4,574.7 7,204 13,426.7
May 9,503.2 17,067.7 29,293.5
June 15,217.3 28,840 51,340
July 6,856.8 15,554.2 31,254.8
August 3,723.9 6,633.9 12,627.1
September 3,805.7 6,015.3 9,928.3
October 4,491.3 6,971.3 10,362.3
November 4,562 6,829 9,228.3
December 4,046.1 6,021.9 7,484.2

All values in cubic feet per second (cfs).

Common questions

When does Yellowstone River at Forsyth, MT normally run highest?
June, on the long-term record. The median daily flow that month is about 28,840 cfs, against 5,467.4 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 Yellowstone River at Forsyth, MT?
It depends on the month. In January, half of days historically fall near 5,467.4 cfs, with the middle 80% of days between 4,001.6 and 7,152.3 cfs. The month-by-month table on this page gives the full range.
How long has Yellowstone River at Forsyth, MT been measured?
Discharge records at USGS site 06295000 begin in 1921, about 105 years, covering roughly 9,198 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Yellowstone River at Forsyth, MT?
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 Yellowstone River at Forsyth, MT?
The gauge sits at 46.26664, -106.6913, in Montana, in hydrologic subbasin 10100001, at an elevation of about 2,512 feet, draining roughly 40,152 square miles.
Can I use Yellowstone River at Forsyth, MT 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 Yellowstone River

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

Other gauges in this subbasin