USGS Water-Year Summary for Site 10336610

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	63680 Turbidity, Form Neph(Min.,Max.,Med.)
	70372 Susp sed particle load,wu,est(Sum) [teracounts/d. Mult by 1e+12]

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

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USGS Water-Year Summary 2023

10336610 Upper Truckee River At South Lake Tahoe, CA

LOCATION - Lat 38°55'21", long 119°59'26" referenced to North American Datum of 1927, in NW 1/4 SE 1/4 sec.04, T.12 N., R.18 E., El Dorado County, CA, Hydrologic Unit 16050101, on left bank, 200 ft downstream from U.S. Highway 50 Bridge, 1.0 mi northeast of South Lake Tahoe Post Office, and 1.4 mi upstream from Lake Tahoe.

DRAINAGE AREA - 54.9 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - Oct. 1971 to Sep. 1974, Oct. 1976 to Jun. 1977, Oct. 1977 to Jun. 1978, Mar. 1980 to current year.

GAGE - Water-stage recorder. Datum of gage is 6,229.04 ft above National Geodetic Vertical Datum of 1929, from topographic map. Prior to Apr. 26, 1984, at datum 2.00 ft higher. Prior to Oct. 19, 1993, at site 200 ft upstream at same datum. Prior to Sep. 03, 2009, at datum 3.52 ft higher.

REMARKS - Two small dams may cause slight regulation at times. Some small diversions for domestic use upstream from station. Echo Lake conduit (station 11434500) diverts from Echo Lake (station 10336608), to South Fork American River Basin. 10/01/2013-09/30/2014: Records good except for estimated daily discharges, which are poor. 10/01/2014-09/30/2015: Records good except for estimated daily discharges, which are poor. 10/01/2015-09/30/2016: Records good except for estimated daily discharges, which are poor. 10/01/2016-09/30/2017: Records fair except for estimated daily 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 fair 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 poor.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 5,480 ft³/s, Jan. 02, 1997, gage height, 9.95 ft; maximum gage height, 13.04 ft, Feb. 9, 2017; minimum daily, 0.01 ft³/s, Sep. 06, 2001.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1972-74, 1978, 1980 to current year.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Mar. 1981 to Sep. 1983. WATER TEMPERATURE: Oct. 1971 to Jun. 1974, Oct. 1977 to Jun. 1978, Mar. 1980 to Sep. 1992, Sep. 1997 to Sep. 2003, Oct. 2014 to current year. SUSPENDED-SEDIMENT DISCHARGE: Oct. 1971 to Jun. 1974, Oct. 1977 to Jun. 1978, Mar. 1980 to Sep. 1992. TURBIDITY: Oct. 2014 to current year.

REMARKS - In Oct. 1992, 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 Environmental Research Center (previously the Tahoe Research Group). The original hydrazine method used to determine nitrate plus nitrite concentrations (parameter codes 000631 and 000630) was found to have interferences caused by calcium and magnesium in stream water samples. The current laboratory method uses pyrophosphate to remove interferences caused by calcium and magnesium. This method has replaced the original hydrazine method as of Dec. 2008. Parameter code 00623, filtered ammonia plus organic nitrogen (dissolved Kjeldahl nitrogen) was discontinued in Apr. 2011. Water temperature data for Sept. 1997 were not published but are available from the U.S. Geological Survey in Carson City, NV. Prior to Oct. 2011, quality assurance blank samples associated with the entire Lake Tahoe Interagency Monitoring Program were listed under station numbers 103366769999 and 103367309999. Starting Oct. 2011, quality assurance blanks are included with the station number where the blanks are processed.