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USGS Water-Year Summary 2024
05466500 EDWARDS RIVER NEAR NEW BOSTON, IL
LOCATION - Lat 41°11'13", long 90°58'02" referenced to North American Datum of 1927, in sec.21, T.14 N., R.5 W., Mercer County, IL, Hydrologic Unit 07080104, on left bank at downstream side of bridge on State Highway 17, 1.5 mi. northeast of New Boston, and at mile 4.6.
DRAINAGE AREA - 445 mi². (Revised WDR IL-75-1)
REVISIONS HISTORY - WSP 1508: 1935-36(M), 1938-40(M), 1941, 1943. WDR IL-75-1: Drainage area.
Revisions: Gage datum was updated to 529.13 ft NAVD88 on May 24, 2023, as determined by a GNSS Level II survey. Gage datum was previously published as 529.92 ft, Fourth General Adjustment of 1912. From 2005 to 2013, incorrectly published as 529.92 ft above National Geodetic Vertical Datum of 1929 (529.70 ft NAVD 1988). From 1978 to 1991, and from 2002 to 2004, incorrectly published as 529.92 ft above National Geodetic Vertical Datum of 1929.
Revisions: Gage datum was updated to 529.13 ft NAVD88 on May 24, 2023, as determined by a GNSS Level II survey. Gage datum was previously published as 529.92 ft, Fourth General Adjustment of 1912. From 2005 to 2013, incorrectly published as 529.92 ft above National Geodetic Vertical Datum of 1929 (529.70 ft NAVD 1988). From 1978 to 1991, and from 2002 to 2004, incorrectly published as 529.92 ft above National Geodetic Vertical Datum of 1929.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: October 1934 to current. Monthly discharge only for some periods, published
in WSP 1308.
STAGE: Water years 1994 to current.
SURFACE-WATER QUALITY
CHEMICAL: Water years 1978-91. Additional chemical data for water years 1959, 1971-77 are
published in Water-Resources Investigations 78-23 and 79-24 as site LF 01.
SEDIMENT: January 1979 to September 1981.
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: October 1934 to current. Monthly discharge only for some periods, published
in WSP 1308.
STAGE: Water years 1994 to current.
SURFACE-WATER QUALITY
CHEMICAL: Water years 1978-91. Additional chemical data for water years 1959, 1971-77 are
published in Water-Resources Investigations 78-23 and 79-24 as site LF 01.
SEDIMENT: January 1979 to September 1981.
GAGE - Water-stage recorder, satellite telemeter and crest-stage gage. Datum of gage is 529.13 ft above North American Vertical Datum of 1988. Prior to Mar. 1, 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 FOR PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 18,000 ft³/s, Apr. 22, 1973, gage height, 23.33 ft; maximum gage height 24.13 ft. Sept. 14, 2008, discharge, 10,300 ft³/s; minimum, 1.2 ft³/s, Oct. 19, 20, 1988.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily mean, 11,600 mg/L May 29, 1980; minimum daily mean, 9 mg/L Feb. 15, 1981.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 75,400 tons Apr. 14, 1981; minimum daily, 1.4 tons Oct. 12, 13, 1979.
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 18,000 ft³/s, Apr. 22, 1973, gage height, 23.33 ft; maximum gage height 24.13 ft. Sept. 14, 2008, discharge, 10,300 ft³/s; minimum, 1.2 ft³/s, Oct. 19, 20, 1988.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily mean, 11,600 mg/L May 29, 1980; minimum daily mean, 9 mg/L Feb. 15, 1981.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 75,400 tons Apr. 14, 1981; minimum daily, 1.4 tons Oct. 12, 13, 1979.
