USGS Water-Year Summary 2021
07124000 ARKANSAS RIVER AT LAS ANIMAS, CO
LOCATION - Lat 38°04'51", long 103°13'09" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 sec.03, T.23 S., R.52 W., Bent County, CO, Hydrologic Unit 11020009, in middle on downstream side of bridge on U.S. Highway 50, 1.1 mi north of courthouse in Las Animas, and 4.2 mi upstream from Purgatoire River.
DRAINAGE AREA - 14,245 mi² of which 441 mi² probably is noncontributing.
- WDR-US-2011: Drainage area.
PERIOD OF RECORD - May to November 1898 (gage heights only), August to November 1909 (gage heights and discharge measurements only), May 1939 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 3,883.97 ft above NGVD of 1929. May 13 to Nov. 12, 1898, and Aug. 1 to Nov. 10, 1909, nonrecording gages near present site at different datums. May 23, 1939 to Apr. 27, 1967, water-stage recorder at site 0.4 mi downstream at datum 9.00 ft lower. Prior to June 21, 2001, gage located on right bank at upstream side of bridge at same datum.
EXTREMES FOR PERIOD PRIOR TO REGULATION - Maximum discharge, 44,000 ft³/s, May 20, 1955, from current-meter measurement and slope-area measurement of overflow channel, gage height, 15.03 ft, site and datum then in use.