USGS Water-Year Summary for Site 08447000

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Max.,Min.,Mean)
	00065 Gage height(Max.,Min.,Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)

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Water year 2021: 2020-10-01 to 2021-09-30

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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.

SURFACE-WATER RECORDS

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)

REMARKS - Flow regulated to large extent by Red Bluff Reservoir near Orla, TX (station 08410000) and many diversions for irrigation between Red Bluff Reservoir and this station. Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.

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).

WATER-QUALITY RECORDS

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.

INSTRUMENTATION -

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.

REMARKS - Interruptions or periods of missing record may be due to instrument failure, no flow conditions or data corrections exceeding allowable criteria, which were deleted. Other than no flow conditions, minimum and maximum extremes may have occurred during period of missing record.