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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
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USGS Water-Year Summary 2024
06041000 MADISON RIVER BELOW ENNIS LAKE, NEAR MCALLISTER, MT
LOCATION - Lat 45°29'24.83", long 111°38'04.22" referenced to North American Datum of 1983, in SW 1/4 SE 1/4 NW 1/4 sec.17, T.4 S., R.1 E., Madison County, MT, Hydrologic Unit 10020007, on right bank 500 ft downstream from Madison powerplant, 1.5 mi downstream from Ennis Lake, 5.7 mi northeast of McAllister, and at river mile 38.8.
DRAINAGE AREA - 2,150.4 mi².
REVISIONS HISTORY - WSP 1559: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1901 to December 1905, October 1906 to current year. Prior to October 1938 adjusted monthly runoff only, published in Water Supply Paper (WSP) 1309. Published as "below Madison Reservoir" 1938-49. Records published as "near Red Bluff" 1890-94 and as "near Norris" 1910 are not equivalent and are published as "near Norris" in WSP 1309.
GAGE - Water-stage recorder. Elevation of gage is 4,689.03 ft (levels by U.S. Army Corps of Engineers), referenced to the National Geodetic Vertical Datum of 1929. Prior to May 7, 1941, nonrecording gage in wooden stilling well at present site at different elevation. May 7, 1941, to Jan. 13, 1945, nonrecording gages in concrete stilling well at present site and elevation.
REMARKS - Flow is regulated by Hebgen Lake (station number 06038000) and Ennis Lake (station number 06040500).
Diversions for irrigation occur upstream from the station.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1972-73, 1977 to current year.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: June 1977 to current year.
INSTRUMENTATION - Water temperature recorder was installed June 21, 1977.
REMARKS -
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 24.9°C, July 5; minimum, 0.0°C several to many days during winter months most years.
