USGS Water-Year Summary for Site 08104050

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	Available Parameters
	62614 Elevation, lake/res, NGVD29(Mean)

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

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USGS Water-Year Summary 2023

08104050 Stillhouse Hollow Lake near Belton, TX

LOCATION - Lat 31°01'20", long 97°31'57" referenced to North American Datum of 1927, Bell County, TX, Hydrologic Unit 12070203, in intake structure at Stillhouse Hollow Dam on Lampasas River, 5 mi southwest of Belton, and 16.0 mi upstream from mouth of the Lampasas River.

DRAINAGE AREA - 1,313 mi².

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

SURFACE-WATER RECORDS

PERIOD OF RECORD - Sept. 1966 to Sept. 2000 (contents furnished by U.S. Army Corps of Engineers), Oct. 2000 to Sept. 2002 (daily mean contents). Oct. 2002 to current year. Prior to Oct. 1970, published as "Stillhouse Hollow Reservoir". PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: Oct. 1969 to Sept. 1982, Jan. 1988 to Sept. 1997. BIOCHEMICAL DATA: Oct. 1969 to Sept. 1982, Jan. 1988 to Sept. 1997.

GAGE - Water-stage recorder. Datum of gage is 0 ft above NGVD29. Satellite telemeter at station.

COOPERATION - Prior to Oct. 1, 2000, record of contents furnished by the U.S. Army Corps of Engineers and reviewed by the U.S. Geological Survey. A new capacity table, provided by Texas Water Development Board, was put into use beginning Oct. 1, 1995.

REMARKS - Records good. The lake is formed by a rolled earthfill dam 15,624 ft long, including a 1,650-ft spillway and 5,894-ft dike. The lake was operated as a temporary detention basin from Sept. 2, 1966, to Feb. 19, 1968. Deliberate impoundment began Feb. 19, 1968. The dam is owned by the U.S. Army Corps of Engineers. The lake was built for flood control and water conservation. The spillway is an uncontrolled broad-crested weir 1,650 ft long located near right end of dam. The flood-control outlet consists of a 12.0-ft-diameter conduit controlled by two 5.67- by 12.0-ft slide gates at an invert elevation of 515.0 ft. There are many small diversions upstream for irrigation, municipal supply and for oil field operations. Data regarding the dam are given in the following table:

                                                                              Elevation (feet)
Top of dam............................................................            698.0
Design flood..........................................................            693.2
Crest of spillway.....................................................            666.0
Top of conservation pool..............................................            622.0
Lowest gated outlet (invert)..........................................            515.0

Water-Quality data published as:

Site ID          Site name
310129097315901  Stillhouse Hollow Lake Site AC
310033097333001  Stillhouse Hollow Lake Site BC
310128097353601  Stillhouse Hollow Lake Site CC
310130097371701  Stillhouse Hollow Lake Site DC
310037097383201  Stillhouse Hollow Lake Site EC

Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.

EXTREMES FOR PERIOD OF RECORD - Sept. 1966 to Sept. 2002: Maximum contents, 654,000 acre-ft, Mar. 4, 1992; minimum contents since conservation storage was reached on Apr. 12, 1969, 172,700 acre-ft, Aug. 23, 1996; Sept. 1996 to current year: maximum elevation, 667.97 ft, Mar. 4, 1992; minimum elevation, 603.28 ft, Sept. 30, 2023.