USGS Water-Year Summary for Site 103366092

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	Available Parameters
	00060 Discharge(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

103366092 Upper Truckee River At Highway 50 Above Meyers, CA

LOCATION - Lat 38°50'55", long 120°01'34" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 sec.31, T.12 N., R.18 E., El Dorado County, CA, Hydrologic Unit 16050101, on left bank, 500 ft downstream of U.S. Highway 50 bridge, 1 mi southwest of Meyers, and 7.5 mi upstream of Lake Tahoe.

DRAINAGE AREA - 39.3 mi².

REVISIONS HISTORY - Drainage area revised from 34.28 mi² on July 11, 2019.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Jun. 1990 to current year.

GAGE - Water-stage recorder. Elevation of gage is 6,310 ft above National Geodetic Vertical Datum of 1929, from topographic map. Jun. 1990 to Sep. 05, 1997 at present site, datum 3.00 ft higher.

REMARKS - 10/01/2013-09/30/2014: Records fair except for estimated daily discharges, which are poor. 10/01/2014-09/30/2015: Records fair except for estimated daily discharges, which are poor. 10/01/2015-09/30/2016: Records fair except for estimated daily discharges, which are poor. 10/01/2016-09/30/2017: Records fair except for estimated discharges, which are poor. 10/01/2017-09/30/2018: Records fair except for estimated discharges, which are poor. 10/01/2018-09/30/2019: Records good except for estimated discharges, which are poor. 10/01/2019-09/30/2020: Records fair except for estimated discharges, which are poor. 10/01/2020-09/30/2021: Records fair except for estimated discharges, which are poor.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 5,120 ft³/s, Jan. 02, 1997, gage height, 8.95 ft; maximum gage height, 9.38 ft, Feb. 08, 2017; minimum daily, 1.2 ft³/s, Dec. 22, 1990.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1990 to Sept. 2011 (discontinued).

PERIOD OF DAILY RECORD - WATER TEMPERATURE: Sept. 1997 to Sept. 2003 (discontinued).

INSTRUMENTATION - Water temperature recorder Sept. 1997 to Sept. 2003, two times per hour.

REMARKS - In Nov. 1989, station was incorporated into the expanded Lake Tahoe Interagency Monitoring Program to monitor tributary contributions of nutrients and sediment to Lake Tahoe. Nutrient samples were analyzed by the University of California, Davis, Tahoe Research Group. Water temperature data for Sep. 1997 were not published but are available from the U.S. Geological Survey, Carson City, NV. Quality assurance samples associated with the entire Lake Tahoe Interagency Monitoring Program are listed under station numbers 103366769999 and 103367309999. The original hydrazine method used to determine nitrate plus nitrite concentrations (parameters 00631 and 00630) was found to have interferences caused by calcium and magnesium in stream water samples. The nitrate plus nitrite concentrations under parameters 99911 and 99910 are based on a laboratory method that uses pyrophosphate to remove interferences caused by calcium and magnesium. This method has replaced the original hydrazine method as of December 2008. Parameter code 00623, filtered ammonia plus organic nitrogen (dissolved Kjeldahl nitrogen) was discontinued in April 2011.

EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 21.0°C, Jul. 14; minimum, freezing point on many days.