USGS Water-Year Summary for Site 09128000

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	00060 Discharge(Mean)

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

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USGS Water-Year Summary 2023

09128000 GUNNISON RIVER BELOW GUNNISON TUNNEL, CO

LOCATION - Lat 38°31'45", long 107°38'54" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 sec.10, T.49 N., R.7 W., Montrose County, CO, Hydrologic Unit 14020002, on left bank 0.4 mi downstream from east portal of Gunnison Tunnel, 4.7 mi downstream from Crystal Creek, and 12 mi northeast of Montrose.

DRAINAGE AREA - 3,971 mi².

REVISIONS HISTORY - WSP 1313: 1906 (M). WSP 1733: 1918-19, 1948. WDR CO-77-2: 1926, 1941. WDR-US-2011: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1903 to current year. Monthly discharge only for some periods, published in WSP 1313. Published as "at east portal of Gunnison Tunnel" 1905-6 and as "at River portal" 1907-11. Statistical summary computed for 1911 to current year.

GAGE - Water-stage recorder with satellite telemetry and crest-stage gage. Datum of gage is 6,526.06 ft above NGVD of 1929. Apr. 9, 1905 to Aug. 20, 1915, nonrecording gage at site 300 ft upstream from diversion dam at east portal of Gunnison Tunnel, at different datum. Aug. 21, 1915 to Jan. 19, 1943, nonrecording gage at site 500 ft downstream from diversion dam at east portal of Gunnison Tunnel, at different datum. Jan. 20, 1943 to Sept. 30, 1956, water-stage recorder at present site at datum 1.0 ft higher.

REMARKS - Water year 2014; records good except for estimated daily discharges, which are poor. Water year 2015; no estimated daily discharges. Records good. Water year 2016; no estimated daily discharges. Records good. Water year 2017; no estimated daily discharges. Records good. Water year 2018; records good except for estimated daily discharges, which are fair. Water year 2019; records good except for estimated daily discharges, which are fair. Water year 2020; no estimated daily discharges. Records good. Water year 2021; no estimated daily discharges. Records good. Water year 2022; no estimated daily discharges. Records good. Water year 2023; no estimated daily discharges. Records good. Natural flow of stream affected by transmountain diversions, transbasin diversion through Gunnison Tunnel for irrigation of about 75,000 acres in Uncompahgre Valley, Taylor Park Reservoir (station 09108500), Blue Mesa Reservoir (station 09124600), Morrow Point Reservoir (station 09125400), Crystal Reservoir (station 09127600), diversions for irrigation of about 63,000 acres, and return flow from irrigated areas. Prior to 2014, Gunnison Tunnel diversion data was provided by Colorado Division of Water Resources.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 19,000 ft³/s, June 15, 1921, from rating curve extended above 14,000 ft³/s, gage height, 15.80 ft, at present datum.