USGS Water-Year Summary 2020
07346000 Big Cypress Creek near Jefferson, TX
LOCATION - Lat 32°44'58", long 94°29'55" referenced to North American Datum of 1927, Marion County, TX, Hydrologic Unit 11140306, on right bank 950 ft downstream from Ferrell's Bridge Dam, 7.6 mi upstream from French Creek, and 8.5 mi west of Jefferson.
DRAINAGE AREA - 850 mi².
PERIOD OF RECORD - Aug. 1924 to Dec. 1959, published as Cypress Creek near Jefferson, Oct. 1979 to current year. Records of stage and discharge for the period Oct. 1959 to Sept. 1979 published by the U.S. Army Corps of Engineers, New Orleans District.
PERIOD OR RECORD, Water-Quality.--
CHEMICAL DATA: Aug. 1981 to Aug. 2004.
BIOCHEMICAL DATA: Aug. 1981 to Aug. 2004.
RADIOCHEMICAL DATA: Feb. 1999 to Aug. 2004.
PESTICIDE DATA: Oct. 1991 to May 1992.
SEDIMENT DATA: Aug. 2006.
GAGE - Water-stage recorder. Datum of gage is 180.00 ft above NGVD of 1929 (U.S. Army Corps of Engineers benchmark). Prior to Nov. 2, 1933, staff gage. Nov. 2, 1933, to Dec. 8, 1955, water-stage recorder, at site about 950 ft upstream at datum 3.70 ft higher. After Dec. 9, 1955, at site about 550 ft downstream or at present site and datum. Satellite telemeter at station.
EXTREMES FOR PERIOD PRIOR TO REGULATION - WATER YEARS, 1925-1957: Maximum discharge, 57,100 ft³s Apr. 1, 1945, gage height, 28.78. ft, site and datum then in use, from rating curve extended above 29,000 ft³s; no flow at times.
AVERAGE DISCHARGE FOR PERIOD PRIOR TO REGULATION - 33 years (water years 1925-57), prior to completion of Ferrell's Bridge Dam, 660 ft³s (478,500 acre-ft/yr).