USGS Water-Year Summary for Site 08096500

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

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

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USGS Water-Year Summary 2023

08096500 Brazos River at Waco, TX

LOCATION - Lat 31°32'09", long 97°04'23" referenced to North American Datum of 1927, McLennan County, TX, Hydrologic Unit 12060202, on left bank downstream side of Loop 340 bridge; on left bank 2.2 mi downstream from bridge on LaSalle Avenue and at mile 400.7.

DRAINAGE AREA - 29,559 mi² of which 9,566 mi² probably is noncontributing.

REVISIONS HISTORY - WSP 850 and 878: 1899-1900, 1907-09 (monthly and yearly summaries only). WSP 1512: 1901-05, 1910, 1915, 1925-26(M), 1927-29. WSP 1922: 1957. WDR TX-03-3: Drainage area. April 27, 2023 to Sept. 08, 2023, Daily mean discharges.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Oct. 1898 to current year. PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: Mar. 1968 to Sept. 1976. BIOCHEMICAL DATA: Mar. 1968 to Sept. 1976. PESTICIDE DATA: Mar. 1968 to Sept. 1976.

GAGE -

Water-stage recorder. Satellite telemetry at station.

Datum of gage: 349.39 ft NAVD88 based on a Level 2 Static GNSS survey processed through OPUS, Ref Frame: NAD83 (2011)(EPOCH:2010.0000) ITRF2014 (EPOCH:2022.8322) and Geoid 18. The survey was completed on October 31st, 2022, while occupying a TRM referenced to local datum via differential levels.

Prior to 10/31/2022, the datum of the gage was 349.34 ft NGVD29. Sept. 14, 1898, to Mar. 28, 1918, May 6, 1922, to Feb. 12, 1925, nonrecording gage, and Mar. 28, 1918, to May 5, 1922, Feb. 13, 1925, to Aug. 14, 1969, water-stage recorder. Prior to Aug. 14, 1969, at site 3.9 mi upstream at datum 7.46 ft higher.

REMARKS - Records fair. Since water year 1941, at least 10% of contributing drainage area has been regulated. There are diversions above station for municipal supply, irrigation, and for oil field operations of varying that affect flow. 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 for 1847-98, 34.63 ft May 28, 1885, from floodmark at site 3.9 mi upstream.

EXTREMES FOR PERIOD PRIOR TO REGULATION - WATER YEARS 1899-1940: Maximum discharge since 1847, 246,000 ft³/s Sept. 27, 1936 (gage height, 40.90 ft), at former site and datum, levee on left bank was overtopped and broken by flood; no flow Aug. 20, 21, 1918, and for several days in Aug. 1923.

AVERAGE DISCHARGE FOR PERIOD PRIOR TO REGULATION - 42 years (water years 1899-1940), 2,560 ft³/s (1,855,000 acre-ft/yr).