USGS Water-Year Summary 2020
09429490 COLORADO RIVER ABOVE IMPERIAL DAM, AZ-CA
LOCATION - Lat 32°53'01", long 114°28'00" referenced to North American Datum of 1927, Imperial County, CA, Hydrologic Unit 15030104, Gila and Salt River meridian. Imperial Dam is 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 is noncontributing.
PERIOD OF RECORD - 1903-34 (yearly discharge only, published in WSP 1313), July 1934 to current year (monthly discharge only Oct. 1942 to Sept. 1979). Prior to Oct. 1942 published as "near Picacho, Ca." Oct. 1942 to Sept. 1971 published as "at Imperial Dam" (monthly discharge shown as "flow reaching Imperial Dam," listed as supplement to "flow passing Imperial Dam").
GAGE - None. This record is synthesized from records of several other stations (see REMARKS). July 13, 1934, to Sept. 30, 1942, water-stage recorder at site 14.5 mi upstream at datum 167.38 ft above sea level.
COOPERATION - Imperial Irrigation District and contents of Senator Wash Reservoir furnished by Bureau of Reclamation.
EXTREMES FOR PERIOD OF RECORD - 1934 to current year: Maximum discharge of 40,800 ft³/s on Sept. 5, 1939; minimum discharge of 538 ft³/s on Aug. 3, 1934; minimum daily since regulation of Hoover Dam began, 1,450 ft³/s on Feb. 17, 1935.
PERIOD OF RECORD - Aug. 1969 to Sept. 1992, Aug. 1996 to current year.
PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Oct. 1969 to Sept. 2000.
WATER TEMPERATURE: Oct. 1974 to Sept. 2000.
INSTRUMENTATION - Streamflow not gaged by USGS.