USGS Water-Year Summary 2019
08072050 San Jacinto River near Sheldon, TX
LOCATION - Lat 29°52'34", long 95°05'37" referenced to North American Datum of 1927, Harris County, TX, Hydrologic Unit 12040104, on left bank at U.S. Highway 90 bridge, 0.3 mi downstream from Southern Pacific Railway Co. bridge, 1.5 mi east of Sheldon, 4.6 mi downstream from Lake Houston, and 21 mi northeast of Houston.
DRAINAGE AREA - 2,879 mi².
PERIOD OF RECORD - Feb. 1970 to Sept. 1972 (elevations only), Oct. 1972 to current year (gage heights only).
GAGE - Water-stage recorder. Datum of gage is NAVD 1988. Prior to Oct. 1 2009, datum of gage was 0.69 ft below NGVD of 1929, adjustment of 1973 (0.98 ft above current datum). Prior to Oct. 1972, datum of gage was NGVD of 1929 (levels by Harris County Flood Control District) unadjusted for land-surface subsidence. Radio telemeter at station. Satellite telemeter at station.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum elevation since at least 1875, 31.5 ft Nov. 26, 1940, at site 0.3 mi upstream at Southern Pacific Railway Co. bridge.
EXTREMES FOR PERIOD OF RECORD
Maximum gage height, 28.72 ft, Aug. 29, 2017 (Hurricane Harvey); minimum gage height, -2.94 ft, Dec. 26, 2012. A discharge measurement of 356,000 ft³/s was made near a peak of Oct. 19, 1994, gage height, 27.00 ft. (datum then in use).
PERIOD OF RECORD - PERIOD OF RECORD, Water-Quality.--
CHEMICAL DATA: May 1971 to Aug. 1972, July 2012 to current.
BIOCHEMICAL DATA: May 1971 to Aug. 1972, July 2012 to current.
BIOLOGICAL DATA: May 1971 to Aug. 1972.
PESTICIDE DATA: May 1971 to Aug. 1972.
SEDIMENT DATA: July 2012 to current.