USGS Water-Year Summary for Site 09406000

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	63680 Turbidity, Form Neph(Max.,Min.,Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

09406000 VIRGIN RIVER AT VIRGIN, UT

LOCATION - Lat 37°12'15", long 113°10'48" referenced to North American Datum of 1927, in SW 1/4 NW 1/4 SW 1/4 sec.23, T.41 S., R.12 W., Washington County, UT, Hydrologic Unit 15010008, on right bank 0.25 mi downstream from North Creek and 0.5 mi east of Virgin.

DRAINAGE AREA - 956 mi².

REVISIONS HISTORY - WSP 1313: 1942-43(M), 1947-48(M). WSP 1633: 1921(M), 1950-51. WDR-UT-89-1: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - April 1909 to September 1971, October 1978 to current year. Fragmentary prior to 1926, monthly discharge published in WSP 1313.

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 3,495.73 ft. above NAVD of 1988 from a Level II GNSS survey conducted on February 9, 2021. Prior to December 19, 1949, several nonrecording gages within 3 mi of present site at various datums. December 19, 1949, to September 1971, 2 mi downstream on right bank. October 1, 1978 to July 5, 1985, 2 mi downstream on left bank. July 5, 1985 to August 29, 2007, 50 ft upstream on right bank. All sites prior to August 29, 2007 at different datums.

REMARKS - Records generally good except estimated discharges which are fair to poor. Diversion for irrigation upstream of gage.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 22,800 ft³/s, Dec 6, 1966, gage height, 18.00 ft, datum then in use; minimum daily discharge, 22 ft³/s, Jul 10, 1920 and Jun 11, 1921.

WATER-QUALITY RECORDS

PERIOD OF RECORD - WATER TEMPERATURE: October 2004 to current year. SPECIFIC CONDUCTANCE: October 2004 to current year. DISSOLVED OXYGEN: October 2004 to current year. TURBIDITY: October 2004 to current year.

INSTRUMENTATION - Water quality monitor with temperature, dissolved oxygen, conductance, and turbidity sensors since Oct 19, 2004.

REMARKS - Quality of data for specific periods can be obtained by contacting the Utah Water Science Center.

EXTREMES FOR PERIOD OF RECORD - WATER TEMPERATURE: Maximum, 31.6 °C, Jun 29, 2015; minimum, -0.1 °C, Jan 2, 2019. SPECIFIC CONDUCTANCE: Maximum, 3,730 microsiemens/cm, Aug 23, 2020; minimum, 185 microsiemens/cm, Dec 5, 2019. DISSOLVED OXYGEN: Maximum, 15.3 mg/l, Nov 21, 2004; minimum, 1.6 mg/l, Jan 5, 2008. TURBIDITY: Maximum, 3,990 FNU, Jul 29, 2020; minimum, 1.0 FNU, Apr 11, 2020, 2.0 NTU, Nov 14, 2005.