USGS Water-Year Summary 2023
06052500 GALLATIN RIVER AT LOGAN, MT
LOCATION - Lat 45°53'07.28", long 111°26'17.83" referenced to North American Datum of 1983, in SE 1/4 NW 1/4 NE 1/4 sec.35, T.2 N., R.2 E., Gallatin County, MT, Hydrologic Unit 10020008, on right bank at former county road bridge site, 0.2 mi upstream from present county bridge, 0.5 mi west of Logan, and at river mile 6.3.
DRAINAGE AREA - 1,789 mi².
- WSP 1389: 1898-99; 1903; 1905; 1929, maximum discharge (M); 1935-36 (M); 1938-39 (M); 1941 (M). WSP 1559: Drainage area.
PERIOD OF RECORD - September 1893 to December 1905, August 1928 to current year. Monthly discharge only for some periods, published in Water Supply Paper (WSP) 1309.
GAGE - Water-stage recorder. Elevation of gage is 4,086.42 ft, referenced to the National Geodetic Vertical Datum of 1929. Prior to Aug. 10, 1928, nonrecording gages at several sites within 0.5 mi of present site at various elevations. Aug. 10, 1928, to Oct. 7, 1941, nonrecording gage at present site and elevation.
EXTREMES FOR PERIOD OF RECORD - Maximum peak flow observed, site and datum then in use. Maximum peak stage from floodmark, backwater from ice. Instantaneous low flow observed.
PERIOD OF RECORD - Water years 1949, 1951, 1957, 1965, 1979-86, 1999 to current year.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: August 1979 to September 1985, October 1999 to current year (varies between
water year and seasonal records).
INSTRUMENTATION - Water temperature probe installed seasonally due to ice.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 28.5°C, July 19-21, 2003; minimum, 0.0°C, on many days during winter periods.