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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
05555300 VERMILION RIVER NEAR LEONORE, IL
LOCATION - Lat 41°12'30", long 88°55'50" referenced to North American Datum of 1983, in SW 1/4 SW 1/4 sec.30, T.32 N., R.3 E., LaSalle County, IL, Hydrologic Unit 07130002, on left downstream side of bridge on County Highway 57 (Red, White and Blue Bridge Road), 3 mi northeast of Leonore, 6.2 mi downstream from Otter Creek, 8 mi northwest of Streator, and at mile 17.2.
DRAINAGE AREA - 1,251 mi². at site prior to October 1971, 1,278 sq. mi.
REVISIONS HISTORY -
WSP 745: 1931-32. WSP 1308: 1932(M), 1935-38(M), 1940(M), 1942(M). WDR IL-75-1: Drainage area.
Revisions: Gage height and discharge for Aug, 29, 2019, were revised on Mar. 25, 2020, to fill a gap in the record.
Revisions: Gage datum was revised to 521.14 ft NAVD88 on June 6, 2023, as determined by a GNSS Level II survey using GEOID18. Oct. 1, 1971, to June 6, 2023, gage datum was published as 520.58 ft above NGVD of 1929 (520.40 ft NAVD 1988), furnished.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: May 1931 to current. Prior to October 1971, published as "at Lowell."
STAGE: Water years 1994 to current.
SURFACE-WATER QUALITY
CHEMICAL: Water years 1978 to 1991 and 2009 to 2011.
SEDIMENT: June 1980 to September 1981.
MISCELLANEOUS: Contaminants in streambed sediments, July 1996; contaminants in fish tissue,
July 1996.
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: May 1931 to current. Prior to October 1971, published as "at Lowell."
STAGE: Water years 1994 to current.
SURFACE-WATER QUALITY
CHEMICAL: Water years 1978 to 1991 and 2009 to 2011.
SEDIMENT: June 1980 to September 1981.
MISCELLANEOUS: Contaminants in streambed sediments, July 1996; contaminants in fish tissue,
July 1996.
GAGE - Water-stage recorder, satellite telemeter and crest-stage gage. Datum of gage is 521.14 ft above NAVD of 1988. Prior to Aug. 20, 1952, nonrecording gage at site 6.8 mi downstream at datum of 500.61 ft NGVD29. Aug. 20, 1952, to Sept. 30, 1971, nonrecording gage at site 6.7 mi downstream, at datum of 500.61 ft NGVD29.
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, 38,900 ft³/s, Apr. 18, 2013, gage height, 30.25 ft; minimum, 2.6 ft³/s, Aug. 3, 1988.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily mean, 6,730 mg/L Aug. 15, 1981; minimum daily mean, 1 mg/L Feb. 5, 1981.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 209,000 tons Aug. 15, 1981; minimum daily, 0.24 ton Feb. 5, 1981.
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 38,900 ft³/s, Apr. 18, 2013, gage height, 30.25 ft; minimum, 2.6 ft³/s, Aug. 3, 1988.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily mean, 6,730 mg/L Aug. 15, 1981; minimum daily mean, 1 mg/L Feb. 5, 1981.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 209,000 tons Aug. 15, 1981; minimum daily, 0.24 ton Feb. 5, 1981.
