USGS Water-Year Summary 2020
07109500 ARKANSAS RIVER NEAR AVONDALE, CO
LOCATION - Lat 38°14'53", long 104°23'55" referenced to North American Datum of 1927, in NE 1/4 SW 1/4 sec.01, T.21 S., R.63 W., Pueblo County, CO, Hydrologic Unit 11020002, near center of span on downstream side of Nyberg Road bridge, 0.3 mi upstream from Sixmile Creek, and 2.6 mi west of Avondale.
DRAINAGE AREA - 6,254 mi².
- WSP 1087: 1942. WDR-US-2011: Drainage area.
PERIOD OF RECORD - May 1939 to September 1951, February 1965 to current year. Statistical summary computed for 1975 to current year, subsequent to partial regulation by Pueblo Reservoir.
GAGE - Water-stage recorder with satellite telemetry and crest-stage gage. Datum of gage is 4,509.53 ft above NGVD of 1929. Prior to Feb. 1, 1965, at site 550 ft downstream on right bank at datum 0.37 ft lower. Feb. 1, 1965 to Sept. 30, 1991, at site on right bank at datum 1.00 ft higher. Oct. 1, 1991 to Nov. 17, 2004, at site on right bank at same datum. Nov. 18, 2004 to Mar. 1, 2007, at site 115 ft upstream on left bank at same datum.
EXTREMES FOR PERIOD OF RECORD
Maximum discharge, 20,900 ft³/s, Apr. 30, 1999, from rating curve extended above 11,500 ft³/s on basis of velocity-area study, gage height, 10.60 ft, from floodmark.