USGS Water-Year Summary for Site 08110000

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

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

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USGS Water-Year Summary 2023

08110000 Yegua Creek near Somerville, TX

LOCATION - Lat 30°19'18", long 96°30'26" referenced to North American Datum of 1927, Burleson County, TX, Hydrologic Unit 12070102,

DRAINAGE AREA - 1,009 mi².

REVISIONS HISTORY - WSP 1512: 1926(M), 1929, 1935. WDR TX-76-2: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - May 1924 to Sept. 1991, Oct 2008 to current year. Oct. 1991 to Sept. 2008 (discharge measurements only).

GAGE -

Water stage recorder and data collection platform (DCP) with satellite telemetry.

Datum of gage: 193.311 ft NAVD88 January 20th, 2023, after a local datum adjustment of -5 ft.

Prior to 1/20/2023, the Datum was 198.311 ft above NAVD88 based on a Level 2 Static GNSS survey processed through OPUS with Ref Frame NAD83 (2011)(EPOCH:2010.0000) ITRF2014 (EPOCH:2020.8575) and Geoid 18. The survey was completed on 11/9/2020 occupying a TRM referenced to local datum via differential levels.

Prior to 11/9/2020, the Datum of gage was 199.21 ft above NGVD29. Prior to Jan. 30, 1934, nonrecording gage at railway bridge 860 ft upstream as datum 34.30 ft higher. Jan. 30, 1934, to Nov. 30, 1970, water-stage recorder at highway bridge 100 ft upstream at same datum.

REMARKS - Records poor, no flow at times. Flow regulated by Lake Somerville (station 08109900) since Jan. 3, 1967. Satellite telemeter at station. 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 1875, 22 ft Dec. 5, 1913, present site and datum, from information by Gulf, Colorado and Santa Fe Railway Co.

EXTREMES FOR PERIOD PRIOR TO REGULATION - Maximum discharge, 56,800 ft³/s July 1, 1940 (gage height 19.27 ft); no flow at times.

AVERAGE DISCHARGE FOR PERIOD PRIOR TO REGULATION - 42 years (water years 1925-1966) unregulated, 292 ft³/s (211,400 acre-ft/yr.