USGS Water-Year Summary 2020
08188800 Guadalupe River near Tivoli, TX
LOCATION - Lat 28°30'20", long 96°53'04" referenced to North American Datum of 1927, Refugio County, TX, Hydrologic Unit 12100204, on right bank at diversion and saltwater barrier, one orifice located upstream and one downstream, 550 ft downstream from Calhoun County Irrigation Canal intake, 0.4 mi downstream from San Antonio River, 3.5 mi north of Tivoli, and at mile 10.2.
DRAINAGE AREA - 10,128 mi².
- WRD TX-68-1: Drainage area.
PERIOD OF RECORD - Sept. 1965 to current year (daily maximum stage), Aug. 2000 to current year (daily mean discharges less than 3,250 ft³/s).
PERIOD OF RECORD, Water-Quality.--
CHEMICAL DATA: Nov. 1965 to Aug. 1999.
BIOCHEMICAL DATA: Nov. 1965 to Sept. 1996.
PESTICIDE DATA: Oct. 1970 to Aug. 1999.
RADIOCHEMICAL DATA: Feb. to May 1981
PERIOD OF DAILY RECORD, Water-Quality.--
SPECIFIC CONDUCTANCE: Oct. 1965 to Oct. 1982.
WATER TEMPERATURE: Oct. 1965 to Oct. 1982.
GAGE - Water-stage recorder. Datum of gage is 0.04 ft above NGVD of 1929. Satellite telemeter at station.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood in July 1936 reached a stage of 11 ft, present site and datum. Maximum stage since at least 1936, that of Oct. 21, 1998. Levees along the Navigation Canal from San Antonio Bay to Victoria were built in 1961, thus decreasing the flood plain.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height (upstream from barrier), 14.8 ft, Oct. 21, 1998. Maximum gage height (downstream from barrier), 14.7 ft, Oct. 21, 1998.