LOCATION.-- Lat 40°06'03", long 87°35'50" (NAD of 1927), in NW1/4NW1/4 sec.22, T.19 N., R.11 W., Vermilion County, Hydrologic Unit 05120109, on right bank at Danville sewage-treatment plant, 1.7 mi upstream from Stony Creek, 2.2 mi southeast of Danville, and at mile 19.5.

DRAINAGE AREA.-- 1,290 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1914 to September 1921, June 1928 to current year. Monthly discharge only for some periods, published in WSP 1305.

STAGE: Water years 1994 to current year.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1978-91.

DISSOLVED OXYGEN: Water years 2001-2003. PH: Water years 2001-2003.

SPECIFIC CONDUCTANCE: Water years 2001-2003.

TURBIDITY: Water years 2001-2003.

WATER TEMPERATURE: Water years 2001-2003.

REVISED RECORDS.-- WSP 853: 1936(M). WSP 973: 1939. WSP 1305: 1915-16, 1920, 1929. WSP 1335: 1934(m). WSP 1909: 1960. WDR IL-75-1: Drainage area. WDR IL-84-1: 1983. WDR IL-92-1: 1991.

GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter, and crest-stage gage. Datum of gage is 503.74 ft above NGVD of 1929 (503.59 ft NAVD 1988) from Aug. 30, 1982 to present. However, datum incorrectly published as 503.33 ft above NGVD of 1929 from Aug. 30, 1982 to Sept. 30, 2001. Prior to Jan. 9, 1935, nonrecording gage at same site and datum 503.33 ft. above NGVD of 1929 (levels by U.S. Army Corps of Engineers)(503.18 ft NAVD 1988). However, datum incorrectly published as 503.99 ft above NGVD of 1929 from 1928 to 1943. Jan. 9, 1935 to Aug. 30, 1982, at site 0.3 mi downstream and datum 503.33 ft above NGVD of 1929 (503.18 ft NAVD 1988).

REMARKS.-- Flow regulated at times by storage at Lake Vermilion on North Fork Vermilion River, 4.5 mi upstream from station, usable capacity, 7,440 acre-ft, and by Danville sewage-treatment plant.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 48,700 ft³/s, March 13, 1939, gage height, 28.59 ft; maximum gage height, 31.56 ft, Apr. 13, 1994, discharge 47,900 ft³/s, minimum daily, 2.0 ft³/s, Oct. 9-14, 1920 and Aug. 10, 1930.