USGS Water-Year Summary for Site 12304500

Click to hide Water-Year Summary instructions and information

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.
For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
Not all sites have reports available for every water year.

	Available Parameters
	00060 Discharge(Mean)

Select a water year

Water year 2024: 2024-10-01 to 2025-09-30

Print this page

USGS Water-Year Summary 2024

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.

REVISIONS HISTORY - WDR MT-2013: Drainage area.

SURFACE-WATER RECORDS

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.

REMARKS -

10-21-2020 to 10-25-2021: records are fair, except estimated records are poor.

11-07-2019 to 10-21-2020: records are fair, except estimated records are poor.

10-22-2018 to 11-06-2019: records are fair, except estimated records are poor. 
03-21-2018 to 10-21-2018: records are good, except estimated records are poor.
10-04-2017 to 03-20-2018: records are good, except estimated records are poor.
11-01-2016 to 10-03-2017: records are good, except estimated records are poor.
10-28-2015 to 10-31-2016: records are good, except estimated records are poor.
10-08-2014 to 10-27-2015: records are good, except estimated records are poor. 
10-01-2013 to 10-07-2014: records are good, except estimated records are poor. 

Minor diversions for irrigation occur upstream from station.

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.

WATER-QUALITY RECORDS

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.

REMARKS - Prior to March 25, 1975, temperature records furnished by U.S. Army Corps of Engineers. Daily water temperature records good, except for June and July, which are fair. Missing maximum temperature data for Aug. 29 due to equipment problems. Several unpublished observations of specific conductance and water temperature were made during the year.

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.