USGS Water-Year Summary 2021
06600000 Perry Creek at 38th Street at Sioux City, IA
LOCATION - Lat 42°32'05.6", long 96°24'37.5" referenced to North American Datum of 1927, in SE 1/4 SE 1/4 SE 1/4 sec.08, T.89 N., R.47 W., Woodbury County, IA, Hydrologic Unit 10230001, on left bank on downstream side of bridge on 38th Street in Sioux City, 1.9 mi downstream from West Branch, and 4.2 mi upstream from mouth.
DRAINAGE AREA - 65.1 mi².
- WSP 1440: Drainage area. WDR IA-95-1: River mile.
PERIOD OF RECORD - Discharge records from October 1945 to September 1969, June 1981 to September 2004; stage-only records from October 2004 to current year.
GAGE - Water-stage recorder. Datum of gage is 1,112.04 ft above National Geodetic Vertical Datum of 1929 (Sioux City benchmark). Prior to May 20, 1954, non-recording gage with supplementary water-stage recorder in operation above 5.0 ft gage height, and May 20, 1954, to September 30, 1969, water-stage recorder, both at datum 5.0 ft higher.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of July 7, 1944, reached a stage of about 30.5 ft, from high-water marks, at current datum, discharge 9,600 ft³/s, on basis of contracted-opening measurement of peak flow by U.S. Army Corps of Engineers.