USGS Water-Year Summary for Site 08104100

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	Available Parameters
	00060 Discharge(Mean,Max.,Min.)
	00065 Gage height(Mean)
	00065 Gage height(Mean) [(2)]

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

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USGS Water-Year Summary 2023

08104100 Lampasas River near Belton, TX

LOCATION - Lat 31°00'06", long 97°29'32" referenced to North American Datum of 1927, Bell County, TX, Hydrologic Unit 12070203, on upstream right-bank of bridge on Toll Bridge Road, 3.3 mi downstream from Stillhouse Hollow Dam, 4.1 mi southwest of Belton, and 12.2 mi upstream from mouth. Prior to Feb. 11, 2016, gage located approximately 1,500 ft upstream on left bank 22 ft upstream from upstream bridge on Interstate Highway 35 and U.S. Highway 81, 3.5 mi downstream from Stillhouse Hollow Dam, 4.1 mi southwest of Belton, and 12.7 mi upstream from mouth.

DRAINAGE AREA - 1,321 mi².

REVISIONS HISTORY - WDR TX-76-2: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Feb. 1963 to Oct. 1989, Apr. 1999 to current year. PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: Apr. 1963 to Aug. 1964, Oct. 1980 to Sept. 1982, Jan. 1988 to July 1990. BIOCHEMICAL DATA: Apr. 1963 to Aug. 1964, Oct. 1980 to Sept. 1982, Jan. 1988 to July 1990. RADIOCHEMICAL DATA: May 1981.

GAGE -

Water-stage recorder. Satellite telemetry at station.

Datum of the gage: 478.521 ft NAVD88 based on a Level 2 Static GNSS survey processed through OPUS, REF Frame NAD83 (2011)(EPOCH:2010.0000) ITRF2014 (EPOCH:2022.1089) and Geoid18. The survey was completed 2/9/2022 while occupying gage reference mark DS RM2.

Prior to 2/9/2022 the Datum of the gage was 476.58 ft NGVD29. (From Texas Department of Highways and Public Transportation levels to a Santa Fe Railroad bench mark.)

REMARKS - Records fair. Since water year 1967, at least 10% of contributing drainage area has been regulated. Many small diversions above station for irrigation and municipal supply. No flow several days in Aug. and Sept. 1967. Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage since at least 1877, 45 ft Sept. 1921, from information by local residents. Flood of May 13, 1957 reached a stage of 44.4 ft (discharge, 83,500 ft³/s).

EXTREMES FOR PERIOD PRIOR TO REGULATION - WATER YEARS 1963-1966: Maximum discharge, 77,900 ft³/s, May 17, 1965, gage height, 43.58 ft; minimum discharge, 0.2 ft³/s, Oct. 14, 15, 16, 1963.

AVERAGE DISCHARGE FOR PERIOD PRIOR TO REGULATION - 3 years (water years 1964-66), 368 ft³/s (266,600 acre-ft/yr).