USGS Water-Year Summary for Site 05469000

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	Available Parameters
	00060 Discharge(Mean)
	00065 Gage height(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

05469000 HENDERSON CREEK NEAR OQUAWKA, IL

LOCATION - Lat 41°00'05.13", long 90°51'15.51" referenced to North American Datum of 1983, in SE 1/4 NE 1/4 SW 1/4 sec.28, T.12 N., R.4 W., Henderson County, IL, Hydrologic Unit 07080104, downstream side of bridge on State Highway 94, 1 mi. south of Bald Bluff, 6.5 mi. northeast of Oquawka, and at mile 20.8.

DRAINAGE AREA - 432 mi².

REVISIONS HISTORY - WSP 1208: 1939, 1942-43, 1948. WSP 1308: 1935-38(M), 1941(M). WDR IL-75-1: Drainage area.
Revisions: Gage datum was updated to 540.64 ft NAVD88 on January 3, 2023, as determined by a GNSS Level II survey. Gage datum was previously published as 541.21 ft NGVD29 (540.99 ft NAVD88) from levels.

SURFACE-WATER RECORDS

PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
  DISCHARGE: October 1934 to September 1996. October 1997 to current. Prior to October
  1938, published as Henderson River. Monthly discharge only for some periods, published
  in WSP 1308.
  STAGE: Water years 1994-1996, 1998 to current.
SURFACE-WATER QUALITY
  CHEMICAL: Water years 1978 to 1991. Additional chemical data for water years 1972-77 are
    published in Water-Resources Investigations 78-23 and 79-24 as site LD 02.
  SEDIMENT: April 1978 to September 1981.

GAGE - Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter, and crest-stage gage. Datum of gage is 540.64 ft above North American Vertical Datum of 1988. Prior to Mar. 4, 1941, nonrecording gage at same site and datum.

REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS IL Water Science Center.

EXTREMES OUTSIDE PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE: Flood of June 1924 reached a stage of 27.8 ft, from flood profile, and an estimated discharge of 20,000 ft³/s.

EXTREMES FOR PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE:
Maximum discharge, 34,600 ft³/s, July 8, 1982, gage height, 31.05 ft; maximum gage height, 32.65 ft, July 25, 1993, discharge 30,800 ft³/s; minimum daily observed, 1.7 ft³/s, Sept. 22, 23, 1940.
SUSPENDED-SEDIMENT CONCENTRATIONS:
Maximum daily mean, 7,070 mg/L May 27, 1981; minimum daily mean, 6 mg/L Feb. 10, 11, 1981.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 33,900 tons Apr. 14, 1981; minimum daily, 0.87 tons Feb. 2-4, 1980.