USGS Water-Year Summary 2021
09429500 COLORADO RIVER BELOW IMPERIAL DAM, AZ-CA
LOCATION - Lat 32°52'03.3", long 114°28'19.6" referenced to North American Datum of 1983, in NW 1/4 SW 1/4 sec.09, T.15 S., R.24 E., Imperial County, CA, Hydrologic Unit 15030107, San Bernardino meridian. The forebay gage is near the All-American Canal headworks at east (revised) end of Imperial Dam, 5 mi upstream from Laguna Dam, 15 mi northeast of Yuma, AZ, 90 mi downstream from Palo Verde Dam, and 147 mi downstream from Parker Dam.
DRAINAGE AREA - 188,500 mi² of which 4,000 mi² probably is noncontributing. in Great Divide basin in southern Wyoming.
Gage height and discharge for the period of Oct. 1, 2019 to Feb.
10, 2020, were revised on Mar. 2, 2020, based on datum correction from levels.
Gage height and discharge for the period of Oct. 1, 2019 to Feb. 23, 2021, were revised on Mar. 29, 2021, based on datum correction from levels.
Gage heights assigned to measured discharges were revised for measurements 938 to 964 on Mar. 29, 2021 as indicated by datum correction analysis on level surveys performed Feb. 20 2020 and Feb. 24, 2021.
PERIOD OF RECORD - October 1960 to July 2015. Prior to October 1971 published as "at Imperial Dam." Records of flow reaching Imperial Dam, formerly published with this station, are now published separately as station 09429490, Colorado River above Imperial Dam. August 2015 to current year.
GAGE - Stage/Velocity recorder.
COOPERATION - Reclamation
EXTREMES FOR PERIOD OF RECORD - Maximum daily discharge of 30,200 ft³/sec on August 18 and 19, 1983; minimum daily discharge of 27 ft³/sec on December 15 and 18, 1969.