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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
07135500 ARKANSAS RIVER AT HOLLY, CO.
LOCATION - Lat 38°02'37", long 102°07'09" referenced to North American Datum of 1927, Prowers County, CO, Hydrologic Unit 11020009, in middle of bridge on downstream side on State Highway 89, 0.7 mi. south of Holly, and half a mile upstream from Wild Horse Creek. Prior to Jan. 20, 2023, gage located on left bank 300 ft upstream from bridge on State Highway 89 at different datum. (REVISED)
DRAINAGE AREA - 25,073 mi² of which 1,648 mi² probably is noncontributing. 25,073 sq mi (revised), of which 1,648 sq mi is probably noncontributing.
SURFACE-WATER RECORDS
PERIOD OF RECORD - January to December 1894 (gage heights only), May 1901 to May 1902 (gage heights, one discharge measurement, and observations of no flow only), October 1907 to September 1953, January 2023 to September 2023. Monthly discharge only for some periods, published in WSP 1311. Published as "at Byron" 1894, 'near Barton" 1901, and "at Barton" 1902. Records include flow of Holly drain above Wild Horse Creek Aug. 28, 1935, to Sept. 30, 1938.
GAGE - Water-stage recorder. Datum of gage is 3,377.95 ft above mean sea level, datum of 1929. Prior to May 4, 1902, staff gages at railroad bridge 6 miles upstream at different datums. Oct. 15, 1907, to 1912, chain and staff gages at bridge 300 ft downstream at different datums. From 1912 to June 6, 1921, water-stage recorder supplemented by chain and staff gages at bridge 300 ft downstream at different datum. June 7, 1921, to May 9, 1951, water-stage recorder supplemented by chain and staff gages at various sites within 900 ft of present site, at datum 0.86 ft higher June 7, 1921, to Apr. 25, 1942, and at present datum thereafter. Prior to Jan. 20, 2023, gage located on left bank 300 ft upstream from bridge on State Highway 89 at different datum.
REMARKS - Water year 2023; records fair except for estimated daily discharges, which are poor. Currently discharge at this site is only rated up to 820 ft³/s. Flows above this are estimated. Flow regulated by John Martin Reservoir since 1943. Natural flow of stream affected by transmountain diversions, storage reservoirs, power developments, ground-water withdrawals and diversions for irrigation of about 500,000 acres and return flow from irrigated areas. Monthly and yearly mean discharge, in cubic feet per second.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge observed, 110,000 ft³/s, Oct. 20, 1908 (gage height, 11.0 ft, site and datum then is use), from rating curve extended above 1,100 ft³/s on basis of logarithmic plotting.
