USGS Water-Year Summary for Site 09237500

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

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USGS Water-Year Summary 2023

09237500 YAMPA RIVER BELOW STAGECOACH RESERVOIR, CO

LOCATION - Lat 40°17'11.56", long 106°49'44.60" referenced to North American Datum of 1983, in sec.29, T.4 N., R.84 W., Routt County, CO, Hydrologic Unit 14050001, on left bank 0.2 mi downstream from base of Stagecoach Dam, 1.0 mi upstream from Morrison Creek, and 6.5 mi east of Oak Creek.

DRAINAGE AREA - 228 mi².

REVISIONS HISTORY - WDR CO-00-2: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - September 1939 to September 1944, monthly discharge only for some periods, published in WSP 1313; October 1956 to September 1972; October 1984 to current year. Prior to October 1990, published as Yampa River near Oak Creek. Statistical summary computed for 1989 to current year.

GAGE - Water-stage recorder with satellite telemetry and crest-stage gage. Elevation of gage is 7,050 ft above NGVD of 1929, from topographic map. Sept. 1939 to Nov. 15, 1939, nonrecording gage, Nov. 16, 1939 to Sept. 1944 and Oct. 1956 to Sept. 1972, water-stage recorder at site 0.2 mi upstream, at different datum. Oct. 1984 to July 15, 2003, water-stage recorder at site 0.2 mi downstream, at different datum. July 15, 2003 to Aug. 4, 2005, water-stage recorder at site 0.15 mi upstream, at different datum. Aug. 4, 2005 to Aug. 16, 2006, water-stage recorder at datum 4.41 ft lower. Aug. 17, 2006 to Dec. 11, 2013, water-stage recorder at different datum.

REMARKS - Water year 2014; records good except for estimated daily discharges, which are poor. Water year 2015; records good except for estimated daily discharges, which are poor. Water year 2016; no estimated daily discharges. Records good. Water year 2017; records good except for estimated daily discharges, which are fair. Water year 2018; no estimated daily discharges. Records good. Water year 2019; no estimated daily discharges. Records good. Water year 2020; records good except for estimated daily discharges, which are fair. Water year 2021; records good except for estimated daily discharges, which are fair. Water year 2022; no estimated daily discharges. Records good. Water year 2023; no estimated daily discharges. Records good. Flow regulated since Dec. 20, 1988, by Stagecoach Reservoir (capacity, 36,460 acre-ft), 50 ft upstream. Natural flow of stream affected by 2 diversions for irrigation to Egeria Creek into Colorado River Basin and by storage in Stillwater, Yampa and YamColo Reservoirs (total capacity, 15,820 acre-ft).

EXTREMES FOR PERIOD PRIOR TO REGULATION - Average discharge for 25 years (water years 1940-44, 1957-72, 1985-88), 89.4 ft³/s; 64,770 acre-ft/yr, prior to completion of Stagecoach Reservoir. Maximum daily discharge for period of record, 1,020 ft³/s, Apr 16, 1962. Minimum daily discharge for period of record, 8.9 ft³/s, May 22, 1963. Maximum discharge and stage for period of record, 1,400 ft³/s, Apr 16, 1962, from rating curve extended above 570 ft³/s, gage height, 7.56 ft, site and datum then in use.