Rivermatics

USGS Streamgage 06329500

Yellowstone River near Sidney, MT

Yellowstone River near Sidney, MT is USGS streamgage 06329500 in Montana, monitoring river discharge in hydrologic subbasin 10100004. It sits on the Yellowstone River, alongside 9 other gauges Rivermatics tracks on the same river. It drains a watershed of about 69,099 square miles. Discharge records at this site go back to 1910. Typical flow runs near 20,880.6 cfs in July and 8,658.3 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, alongside daily high and low water-temperature forecasts.

View live conditions & forecast →

Gauge details

State
Montana
Drainage area
69,099 sq mi
Gauge elevation
1,886 ft
Subbasin (HUC-8)
10100004
Coordinates
47.67741, -104.15541
USGS site number
06329500
Records begin
1910-10-01 (116 years)
Rivermatics forecast
14-day flow outlook + water temperature

14-day flow forecast

Based on observations through for Yellowstone River near Sidney, 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
3,222 3,637 4,203
3,059 3,674 4,578
3,011 3,739 4,917
2,941 3,737 5,074
2,870 3,729 5,200
2,801 3,676 5,226
2,765 3,669 5,355
2,712 3,707 5,537
2,666 3,740 5,758
2,602 3,724 5,894
2,560 3,636 5,737
2,494 3,593 5,800
2,440 3,556 5,916
2,447 3,542 5,892

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 115 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 3,138.4 5,561.3 8,549.7
February 3,883.1 6,008.3 10,496.2
March 5,044.8 8,185.2 18,335.5
April 5,500.3 8,658.3 16,550
May 9,184.2 16,841.9 30,171
June 16,776.7 36,020 61,606.7
July 5,995.2 20,880.6 39,548.4
August 2,795.8 7,447.1 14,703.2
September 3,190.7 6,479 11,250
October 5,009 7,795.5 11,525.8
November 4,786 7,287.7 10,235.3
December 3,164.5 6,117.1 8,425.5

All values in cubic feet per second (cfs).

Common questions

When does Yellowstone River near Sidney, MT normally run highest?
June, on the long-term record. The median daily flow that month is about 36,020 cfs, against 5,561.3 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 near Sidney, MT?
It depends on the month. In January, half of days historically fall near 5,561.3 cfs, with the middle 80% of days between 3,138.4 and 8,549.7 cfs. The month-by-month table on this page gives the full range.
How long has Yellowstone River near Sidney, MT been measured?
Discharge records at USGS site 06329500 begin in 1910, about 116 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 Yellowstone River near Sidney, 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. A companion model forecasts each day's water-temperature high and low. 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 near Sidney, MT?
The gauge sits at 47.67741, -104.15541, in Montana, in hydrologic subbasin 10100004, at an elevation of about 1,886 feet, draining roughly 69,099 square miles.
Can I use Yellowstone River near Sidney, 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