USGS Water-Year Summary for Site 08041000

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	Available Parameters
	00060 Discharge(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

08041000 Neches River at Evadale, TX

LOCATION - Lat 30°21'20", long 94°05'35" referenced to North American Datum of 1927, Jasper County, TX, Hydrologic Unit 12020003, near right bank of low water channel at downstream side of bridge on U.S. Highway 96 at Evadale, 0.8 mi upstream from Mill Creek, 16 mi upstream from Village Creek, and at mile 55.6.

DRAINAGE AREA - 7,951 mi².

REVISIONS HISTORY - WSP 718: 1929. WSP 1342: 1905-07, 1924. WSP 1732: Drainage area at former site.

SURFACE-WATER RECORDS

PERIOD OF RECORD - July 1904 to Dec. 1906, Apr. 1921 to current year. Monthly discharge only for some periods, published in WSP 1312. PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: Sept. 1939 to July 2006. BIOCHEMICAL DATA: Sept. 1939 to Aug. 1994. PESTICIDE DATA: Feb. 1968 to July 1981. SEDIMENT DATA: Oct. 1960 to Aug. 1994.

GAGE - Water-stage recorder. Datum of gage is 8.25 ft above NGVD of 1929. July 1, 1904, to Dec. 31, 1906, nonrecording gage on Gulf, Colorado, and Santa Fe Railway Co. bridge at site 1.2 mi downstream at datum 5.50 ft lower; Apr. 1, 1921, to Dec. 7, 1948, nonrecording gages at site 1.2 mi downstream at present datum; Dec. 8, 1948, to Nov. 8, 1963, water-stage recorder at site 1.2 mi downstream at present datum. Satellite telemeter at station.

REMARKS - Since water year 1951, at least 10% of contributing drainage area has been regulated. There are some diversions upstream for municipal use. Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood in May 1884 reached a stage of 26.2 ft, at former site (discharge, about 125,000 ft³/s), and flood in Aug. 1915 reached a stage of 24.5 ft, at former site (discharge, about 102,000 ft³/s). These are the highest floods since at least 1884. Stages furnished by Gulf, Colorado, and Santa Fe Railway Co.

EXTREMES FOR PERIOD PRIOR TO REGULATION - WATER YEARS, 1905-1906, 1922-1950: Maximum discharge, 92,100 ft³/s May 11, 1944 (gage height, 23.58 ft, from floodmark), at site then in use; minimum daily, 148 ft³/s Sept. 10, 1925.

AVERAGE DISCHARGE FOR PERIOD PRIOR TO REGULATION - 31 years (water years 1905-1906, 1922-1950) 7,089 ft³/s (5,136,000 acre-ft/yr).

WATER-QUALITY RECORDS

PERIOD OF RECORD - CHEMICAL DATA: Sept. 1939 to July 2006. BIOCHEMICAL DATA: Sept. 1939 to Aug. 1994. PESTICIDE DATA: Feb. 1968 to July 1981. SEDIMENT DATA: Oct. 1960 to Aug. 1994.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Oct. 1947 to Sept. 1997. WATER TEMPERATURE: Oct. 1947 to Sept. 1997.

INSTRUMENTATION - Graphic recorder with thermograph Oct. 1954 to Sept. 1963.

REMARKS - Mean monthly and annual concentrations and loads for selected chemical constituents have been computed for previous water years using the daily (or continuous) records of specific conductance and regression relation between each chemical constituent and specific conductance. The computation of the selected constituent loads might include estimated discharge or specific conductance data. Regression equations developed for this station may be obtained from the U.S. Geological Survey Texas Water Science Center upon request.

EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum daily, 670 microsiemens/cm, Mar. 21, 25, 31, 1994; minimum daily, 23 microsiemens/cm, Sept. 19, 1963. WATER TEMPERATURE: Maximum daily, 36.0°C, many days in Aug. 1997; minimum daily, 3.0°C, Jan. 30, 31, 1948, Jan. 31, 1949, and Jan. 24, 1963.