USGS Water-Year Summary 2021
08447000 Pecos River near Sheffield, TX
LOCATION - Lat 30°39'34", long 101°46'11" referenced to North American Datum of 1927, Pecos County, TX, Hydrologic Unit 13070008,
DRAINAGE AREA - 40,685 mi² of which 8,835 mi² probably is noncontributing.
PERIOD OF RECORD - October 1921 to April 1925, October 1939 to September 1949. October 2007 to current year (daily mean discharge below 225 ft³/s).
GAGE - Nonrecording prior to November 8, 1939; recording thereafter. At site 3/4 mile upstream at datum 2.90 ft higher prior to April 30, 1925. Datum of gage is 2,026.60 feet above NAVD88 as determined by GNSS survey. Satellite telemeter at station.
COOPERATION - Texas Commission on Environmental Quality (TCEQ)
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage known, about 23.5 ft in September 1916, site and datum in use prior to May 1, 1925, from information by local residents.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 13,800 ft³/s Oct. 8, 1941 (gage height, 16.75 ft); Maximum gage height, 16.75 ft, Oct. 8, 1941. Peak discharges above 225 ft³/s not computed beginning October, 2007.
AVERAGE DISCHARGE FOR PERIOD OF RECORD - 11 years (water years 1922-1924, 1940-1949), 247 ft³/s (178,800 acre-ft/yr).
PERIOD OF RECORD
CHEMICAL DATA: Oct. 1968 to Aug. 1977
BIOCHEMICAL DATA: Oct. 1969 to July 1973.
PERIOD OF DAILY RECORD
WATER TEMPERATURE: Sept. 2011 to current year.
SPECIFIC CONDUCTANCE: Sept. 2011 to current year.
pH: Sept. 2011 to Sept. 12, 2017. (discontinued)
DISSOLVED OXYGEN: Sept. 2011 to current year.
COOPERATION - Texas Commission on Environmental Quality.
A four parameter continuous water-quality monitoring sonde from Sept. 2011 to Sept. 2017.
A three parameter continuous water-quality monitoring sonde from Sept. 2017 to current year.