Rivermatics

USGS Streamgage 06040050

Madison River at Ennis, MT

Madison River at Ennis, MT is USGS streamgage 06040050 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 1,722 square miles. Discharge records at this site go back to 2025. 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
1,722 sq mi
Gauge elevation
4,931 ft
Subbasin (HUC-8)
10020007
Coordinates
45.34756, -111.72246
USGS site number
06040050
Records begin
2025-07-24 (1 years)
Rivermatics forecast
14-day flow outlook + water temperature

14-day flow forecast

Based on observations through for Madison River at Ennis, 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
834 870 893
815 861 886
797 856 890
784 854 903
770 853 918
768 863 954
764 871 988
752 870 1,018
748 874 1,048
744 878 1,073
742 883 1,097
741 888 1,123
738 891 1,137
736 894 1,145

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 1 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Only 5 of 12 months have enough record to summarize; the rest are omitted.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
July — 1,226.7 —
August — 1,087.4 —
September — 1,051.5 —
October — 1,029.4 —
November — 950.6 —

All values in cubic feet per second (cfs).

Common questions

When does Madison River at Ennis, MT normally run highest?
July, on the long-term record. The median daily flow that month is about 1,226.7 cfs, against 950.6 cfs in November, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
How long has Madison River at Ennis, MT been measured?
Discharge records at USGS site 06040050 begin in 2025, about 1 years, covering roughly 259 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 at Ennis, 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 Madison River at Ennis, MT?
The gauge sits at 45.34756, -111.72246, in Montana, in hydrologic subbasin 10020007, at an elevation of about 4,931 feet, draining roughly 1,722 square miles.
Can I use Madison River at Ennis, 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