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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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USGS Water-Year Summary 2024
08446500 Pecos River near Girvin, TX
LOCATION - Lat 31°06'47", long 102°25'02" referenced to North American Datum of 1927, Pecos County, TX, Hydrologic Unit 13070001, on right bank about 2 mi upstream from Comanche Creek, about 4 mi northwest of Girvin, and over 4 mi upstream from bridge on U.S. Highway 385.
DRAINAGE AREA - 37,300 mi² of which 7,740 mi² probably is noncontributing. The 7,740 mi² includes the contributing area of the former supplementary gage 7.2 mi downstream. Supplementary gage was removed in 2014 but flood measurements will likely continue to be made at the old gage location. Drainage area for the gage is probably 25,960 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - Aug. 1939 to current year.
GAGE - Water-stage recorder with concrete control and measuring flume. Current Datum of the Gage is 2,284.513ft (NAVD88) as defined in September of 2022. Prior to this, the Elevation of the gage was 2,290.00ft above NGVD of 1929, picked from topographic map; and was undefined prior to water year 2000. Supplementary water-stage recorder, 7.2 mi downstream at a datum 2,269.65 ft above NGVD of 1929, was used as the regular gage prior to July 17, 1951, after which it was used only for peaks exceeding about 750 ft^3/s, and was discontinued and removed in the 2014 Water Year.
COOPERATION - Texas Commission on Environmental Quality (TCEQ), the USGS Ground and Streamflow Information Program (GWSIP), and Texas water Development Board (TWDB).
REMARKS - Since installation of gage at least 10% of contributing drainage area has been regulated. There are numerous diversions upstream of station for irrigation. Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Sept. 1932 reached a stage of 17 feet, discharge not determined; information supplied by local residents.
WATER-QUALITY RECORDS
PERIOD OF RECORD -
CHEMICAL DATA: Jan. 1960 to Sept. 1964, Oct. 1967 to Aug. 1982.
BIOCHEMICAL DATA: Mar. 1964, Apr. 1969 to Aug. 1981.
PESTICIDE DATA: May 1968 to July 1974.
PCB DATA: Mar. 1973 to July 1974.
RADIOCHEMICAL DATA: Jan. 1981 to Aug. 1981
PERIOD OF DAILY RECORD -
WATER TEMPERATURE: Sept. 2011 to Nov. 2016, Nov. 2017 to current year.
SPECIFIC CONDUCTANCE: Sept. 2011 to Nov. 2016, Nov. 2017 to current year.
pH: Sept. 2011 to Aug 2015; July 2016 to Nov. 2016, Jul. 2017 to Nov. 2016 (discontinued).
DISSOLVED OXYGEN: Sept. 2011 to Nov. 2016, Nov. 2017 to current year.
COOPERATION - Texas Commission on Environmental Quality (TCEQ).
INSTRUMENTATION -
A four parameter continuous water-quality monitoring sonde since Sept. 2011 -November 2017.
A three parameter continuous water-quality monitoring sonde since November 2017.
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. Some records listed in the "Period of Record" may not be available electronically.
