Rivermatics

USGS Streamgage 06040800

Madison River ab powerplant near McAllister, MT

Madison River ab powerplant near McAllister, MT is USGS streamgage 06040800 in Montana, monitoring river discharge in hydrologic subbasin 10020007. It sits on the Madison River, alongside 7 other gauges Rivermatics tracks on the same river. It drains a watershed of about 2,213 square miles. Discharge records at this site go back to 2002. Typical flow runs near 507.1 cfs in July and 241.4 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
Montana
Drainage area
2,213 sq mi
Gauge elevation
4,703 ft
Subbasin (HUC-8)
10020007
Coordinates
45.48659, -111.63386
USGS site number
06040800
Records begin
2002-04-01 (24 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Madison River ab powerplant near McAllister, 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
99.9 105 110
99.8 106 111
99.9 107 112
100 107 114
99.5 107 117
98.8 107 120
98.6 107 123
97.2 106 122
94.4 106 117
93.6 106 118
94 106 123
94.2 105 141
92.3 105 124
90.6 105 122

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 24 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 95.5 143.6 1,111.3
February 100.3 143.8 969.5
March 101.8 134.8 1,088.6
April 210.8 241.4 1,229.9
May 234.3 856 2,562.3
June 333 1,444.5 3,437.7
July 136.1 507.1 1,731.3
August 98.3 157.5 989
September 99.8 137.8 1,334
October 101.5 165.1 1,347.7
November 100.8 211.7 1,462.7
December 95.1 165.1 1,401

All values in cubic feet per second (cfs).

Common questions

When does Madison River ab powerplant near McAllister, MT normally run highest?
June, on the long-term record. The median daily flow that month is about 1,444.5 cfs, against 134.8 cfs in March, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Madison River ab powerplant near McAllister, MT?
It depends on the month. In January, half of days historically fall near 143.6 cfs, with the middle 80% of days between 95.5 and 1,111.3 cfs. The month-by-month table on this page gives the full range.
How long has Madison River ab powerplant near McAllister, MT been measured?
Discharge records at USGS site 06040800 begin in 2002, about 24 years, covering roughly 8,893 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Madison River ab powerplant near McAllister, 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 Madison River ab powerplant near McAllister, MT?
The gauge sits at 45.48659, -111.63386, in Montana, in hydrologic subbasin 10020007, at an elevation of about 4,703 feet, draining roughly 2,213 square miles.
Can I use Madison River ab powerplant near McAllister, 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 Madison River

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

Other gauges in this subbasin