USGS Water-Year Summary for Site 09149500

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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(Mean,Max.,Min.)
	00400 pH(Med.,Max.,Min.)
	63680 Turbidity, Form Neph(Max.,Med.,Min.)

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

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USGS Water-Year Summary 2023

09149500 UNCOMPAHGRE RIVER AT DELTA, CO

LOCATION - Lat 38°44'31.0", long 108°04'49.5" referenced to North American Datum of 1983, in SW 1/4 SW 1/4 sec.13, T.15 S., R.96 W., Delta County, CO, Hydrologic Unit 14020006, on right bank 525 ft downstream from 5th Street Bridge at west edge of Delta and 1.1 mi upstream from mouth.

DRAINAGE AREA - 1,114 mi².

REVISIONS HISTORY - WSP 1243: 1904. WDR-US-2011: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - April 1903 to October 1931 (no winter records in most years), September 1938 to current year. Monthly discharge only for some periods, published in WSP 1313. Published as "near Delta" 1907-24. Statistical summary computed for 1939 to current year.

GAGE - Water-stage recorder with satellite telemetry and crest-stage gage. Datum of gage is 4,926.49 ft above NGVD of 1929. Feb. 18, 1960 to Mar. 26, 1963, water-stage recorder at site 750 ft upstream at datum 3.43 ft higher. Mar. 27, 1963 to May 12, 1965, water-stage recorder at site 1,050 ft upstream at datum 6.08 ft higher. See WSP 1733 or 1924 for history of changes prior to Feb. 18, 1960.

REMARKS - Water year 2014; no estimated daily discharges. Records good. Water year 2015; records good except for the period May 19 to Sept. 30, and estimated daily discharges, which are poor. Water year 2016; records good except for the period June 23 to Aug. 31, which is fair, and estimated daily discharges, which are poor. Water year 2017; records good except for estimated daily discharges, which are poor. Water year 2018; records good except for estimated daily discharges, which are poor. Water year 2019; no estimated daily discharges. Records good. Water year 2020; records good except for estimated daily discharges, which are poor. Water year 2021; records good except for estimated daily discharges, which are poor. Water year 2022; records good except for estimated daily discharges, which are poor. Water year 2023; records good except for estimated daily discharges, which are poor. Natural flow of stream affected by water diverted from Gunnison River (see record of diversion through Gunnison Tunnel published with station 09128000) and other adjacent basins. Flow regulated by Ridgeway Reservoir, since 1986, total capacity, 84,590 acre-ft. Diversions for irrigation of about 90,000 acres upstream from station and return flow from irrigated areas.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 5,800 ft³/s, May 15, 1984, from rating curve extended above 3,400 ft³/s, gage height, 8.85 ft.