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USGS Water-Year Summary 2024
10344500 Little Truckee River below Boca Dam, near Truckee, CA
LOCATION - Lat 39°23'13", long 120°05'40" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 sec.28, T.18 N., R.17 E., Nevada County, CA, Hydrologic Unit 16050102, on right bank, 800 ft upstream from mouth, 1,000 ft downstream from Boca Dam, and 6.2 mi northeast of Truckee.
DRAINAGE AREA - 173 mi².
REVISIONS HISTORY - WDR CA-79-3: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - April to October 1890 (monthly discharge only), January 1911 to September 1915, January 1939 to current year. Prior to October 1976 published as "at Boca." Monthly discharge only for January 1939 to September 1957, published in WSP 1734.
WATER TEMPERATURE: Water years 1993-98.
GAGE - Water-stage recorder. Elevation of gage is 5,500 ft above NGVD of 1929, from topographic map. Jan. 1, 1911, to Sept. 30, 1915, nonrecording gage at site 650 ft downstream at different datum. January 1939 to September 1957, records computed from daily log of rated settings of needle valve in dam and from computed flow over spillway.
REMARKS - Flow regulated by Boca Reservoir (station 10344490) since 1938, Independence Lake (station 10342900) since 1939, and Stampede Reservoir (station 10344300) since 1969. There is one transmountain diversion to Sierra Valley of about 6,000 acre-ft per year. See schematic diagram of Truckee River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 8,800 ft³/s, Dec. 24, 1955, from records of Washoe County Water Conservation District; no flow for many days in many years.
