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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
08173900 Guadalupe River at Gonzales, TX
LOCATION - Lat 29°29'03", long 97°27'00" referenced to North American Datum of 1927, Gonzales County, TX, Hydrologic Unit 12100202, on right bank on downstream side of U.S. Highway 183 bridge, 4.6 mi downstream from San Marcos River, and at mile 191.1.
DRAINAGE AREA - 3,490 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - July 1915 to Sept. 1922, Oct. 1951 to Sept. 1952 (discharge measurements only), Mar. 1977 to Sept. 1996 (peak stage only), Oct. 1996 to current year. Records for July 1915 to Sept. 1922, published in WSP 408, 438, 458, and 528, are unreliable and should not be used.
PERIOD OF RECORD, Water-Quality.--
CHEMICAL DATA: Apr. 1996 to June 1998.
BIOCHEMICAL DATA: Apr. 1996 to June 1998.
BIOLOGICAL DATA: July 1996 to June 1998.
PESTICIDE DATA: Nov. 1996 to June 1998.
RADIOCHEMICAL DATA: Nov. 1996 to Jan. 1997.
SEDIMENT DATA: Apr. 1996 to June 1998.
STABLE ISOTOPE DATA: Feb. 1998.
GAGE - Water-stage recorder. Datum of gage is 231.80 ft above NGVD of 1929. July 1915 to Sept. 1922, and Oct. 1951 to Sept. 1952, 0.2 mi downstream, datum not known. Mar. 1977 to Sept. 1996, 1.2 mi upstream at Gonzales hydroelectric plant at National Weather Service datum. Satellite telemeter at station.
REMARKS - WY records good. Since water year 1928, at least 10% of contributing drainage area has been regulated. Some water is diverted for irrigation and municipal use (amounts unknown). 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 of May 29, 1929, reached a stage of 38.3 ft, National Weather Service datum.
