USGS Water-Year Summary for Site 09180500

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	Available Parameters
	00010 Temperature, water(Mean,Max.,Min.)
	00045 Precipitation(Sum)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Mean,Max.,Min.)
	00300 Dissolved oxygen(Max.,Mean,Min.)
	00400 pH(Med.,Max.,Min.)
	63680 Turbidity, Form Neph(Min.,Mean,Max.)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

09180500 COLORADO RIVER NEAR CISCO, UT

LOCATION - Lat 38°48'38", long 109°17'34" referenced to North American Datum of 1927, in NW 1/4 NW 1/4 sec.17, T.23 S., R.24 E., Grand County, UT, Hydrologic Unit 14030005, on the left bank one mile downstream from Dolores River, 11 mi. south of Cisco, UT, 36 mi. downstream from Colorado-Utah state line, 97 mi. upstream from Green River, 235 mi. upstream from San Juan River, and at mile 1,022 from Arizona-Sonora border.

DRAINAGE AREA - 24,100 mi². approximately.

REVISIONS HISTORY -

WSP 918: 1913, 1937. WSP 1313: 1918-22.

Specific conductance data for Dec. 29, 2022, were revised on Jan. 8, 2024, deleted due to fouling by ice.

SURFACE-WATER RECORDS

PERIOD OF RECORD - January 1895 to current year (1895 to 1910, calendar-year estimates only). Monthly discharge only for some periods, published in WSP 1313. Published as Grand River near Moab, October 1913 to November 1914, and as Grand River near Cisco, November 1914 to September 1917.

GAGE - Water-stage recorder and crest-stage gage. Elevation of the base gage datum is 4,092.35 ft above NAVD of 1988 from a Level 2 GNSS survey on Aug 25, 2020. The orthometric height (peak-to-peak) error is 0.24 ft. Prior to Aug 25, 2020, the elevation of the gage datum was listed as 4,090 ft above NGVD of 1929, taken from a river-profile map. Prior to November 10, 1914, several staff and chain gages at bridge near Moab, 31 mi downstream at datum 3,937.73 ft above NGVD of 1929.

REMARKS - Records generally good except for estimated daily discharges, which are fair to poor. Diversions above station for irrigation and power, including several transmountain diversions. Flow regulated by Blue Mesa Reservoir since November 27, 1965.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood on Jul 4, 1884 reached a discharge of about 125,000 ft³/s, from flood record at Fruita, Colorado.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 76,800 ft³/s, Jun 19, 1917, gage height, 19.7 ft; minimum recorded, 558 ft³/s, Jul 21, 1934, gage height, 0.44 ft.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - Precipitation: November 2021 to current year. Air Temperature: Jun 29, 2022, to current year. Air Pressure: Jun 29, 2022, to current year. Relative Humidity: Jun 29, 2022, to current year. Wind Speed: Nov 1, 2022, to current year. Wind Direction: Nov 1, 2022, to current year.

EXTREMES FOR PERIOD OF RECORD - Maximum daily precipitation, 0.78 in, Apr 14, 2023. Air Temperature: Maximum recorded, 43.8 deg C, Jul 17, 2023; minimum recorded, -11.9 deg C, Dec 18, 2022. Relative Humidity: Maximum recorded, 100 percent, recorded on many days, 3.3 percent, Jun 26, 2023. Wind Speed: Maximum recorded, 36.6 mph, Feb 22, 2023, minimum recorded, 0.0 mph on several days.

WATER-QUALITY RECORDS

PERIOD OF RECORD - 15 minute data. WATER TEMPERATURE: October 01, 2007 to current year. SPECIFIC CONDUCTANCE: October 01, 2007 to current year. DISSOLVED OXYGEN: November 09, 2021 to current year. pH: November 09, 2021 to current year. TURBIDITY: November 09, 2021 to current year.

PERIOD OF DAILY RECORD - WATER TEMPERATURE: Intermittent daily from May 1949 to November 2005. SPECIFIC CONDUCTANCE: Intermittent daily from October 1935 to November 2005. SUSPENDED-SEDIMENT DISCHARGE: May 1930 to September 1984.

REMARKS - Unpublished daily records of specific conductance obtained before water year 1965 were included in the determination of extremes for period of daily record and are available in files of USGS Utah Water Science Center office, Salt Lake City, Utah. Quality of data for specific periods can be obtained by contacting the Utah Water Science Center.

EXTREMES FOR PERIOD OF RECORD -

WATER TEMPERATURE: Maximum observed, 29.0 °C, Jul 29, 1966, Jul 23, 2021, and Jul 17, 2022; minimum, -0.2 °C, on many days during winter period most years.

SPECIFIC CONDUCTANCE: Maximum daily, 4,820 microsiemens/cm, Dec 13, 1957; minimum daily, 291 microsiemens/cm, May 31, 1953.

SEDIMENT CONCENTRATIONS: Maximum daily mean, 69,000 mg/L, Oct 27, 1951; minimum daily mean, 4 mg/L, Aug 22, 1960. SEDIMENT LOADS: Maximum daily, 2,790,000 tons, Oct 14, 1941; minimum daily, 14 tons, Aug 22, 1960.

DISSOLVED OXYGEN: Maximum, 14.6 mg/l, Dec 04, 2021; minimum, 3.7 mg/l, Aug 18, 2022.

pH: Maximum, 8.9, Dec 04, 2021; minimum, 7.6, Oct 03, 2022.

TURBIDITY: Maximum, >4000 FNU on many days; minimum, 0.0 FNU on many days in Nov and Dec 2021.