USGS Water-Year Summary 2018
12304500 YAAK RIVER NEAR TROY, MT
LOCATION - Lat 48°33'42.20", long 115°58'12.57" referenced to North American Datum of 1983, in NE 1/4 SE 1/4 SE 1/4 sec.05, T.32 N., R.34 W., Lincoln County, MT, Hydrologic Unit 17010103, Kootenai National Forest, on right bank 500 ft. upstream from bridge on U.S. Highway 2, 0.3 mi. upstream from mouth and 7.7 mi. northwest of Troy.
DRAINAGE AREA - 792 mi².
- WDR MT-2013: Drainage area.
PERIOD OF RECORD - October 1910 to September 1916 (fragmentary record), March 1956 to current year.
GAGE - Water-stage recorder. Elevation of gage is 1,839.2 ft, referenced to the National Geodetic Vertical Datum of 1929. Oct. 15, 1910, to Sept. 30, 1916, nonrecording gage at several sites within 11 mi of present site at various elevations.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood in May to June 1948 reached a stage of 11.0 ft, from floodmarks; discharge, 12,500 ft³/s. Flood in May 1954 reached a stage of 11.4 ft, from floodmarks; discharge, 13,400 ft³/s.
PERIOD OF RECORD - Water years 1963-73, 1975-85, May 1999 to current year.
PERIOD OF DAILY RECORD -
WATER TEMPERATURE: Seasonal records 1963-73, 1975-85, April 2000 to September 2003.
EXTREMES FOR PERIOD OF DAILY RECORD -
WATER TEMPERATURE (seasonal records 1963-73, 1975-85, 2001): Maximum, 31.0°C, Aug. 11, 2001; minimum 0.0°C on many days during winter periods.