LOCATION.-- Lat 40°33'11", long 89°46'38" (NAD of 1927), in SE1/4SE1/4 sec.26, T.7 N., R.6 E., Peoria County, Hydrologic Unit 07130003, on right bank at Kingston Mines, 2.3 mi downstream from Mackinaw River, and at mile 145.4. Auxiliary gage (05568615) 8.6 miles downstream.

DRAINAGE AREA.-- 15,818 mi², does not include diversion from Lake Michigan through the Chicago Sanitary and Ship Canal, which has occurred since Jan. 17, 1900.

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1939 to current year.

STAGE: Water years 1994 to current year.

SURFACE-WATER QUALITY

DISSOLVED OXYGEN: May, 2004 to May, 2005.
PH: May, 2004 to May, 2005.

SPECIFIC CONDUCTANCE: May, 2004 to May, 2005.

WATER TEMPERATURE: Water years 1975-77, May, 2004 to May, 2005.

MISCELLANEOUS: Contaminants in streambed sediments, October 1996; contaminants in fish tissue, October 1996.

REVISED RECORDS.-- WSP 1558: 1957. WDR IL-75-1: Drainage area. WDR IL-05: 2004.

GAGE.-- Water-stage recorder, phone telemeter, crest-stage gage, and U.S. Army Corps of Engineers satellite telemeter. Auxiliary water-stage recorder, phone telemeter, and U.S. Army Corps of Engineers satellite telemeter at site 8.6 mi downstream. Datum of gage is 428.00 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers) (427.66 ft NAVD 1988). Prior to Oct. 1, 1940, nonrecording gage at same site at datum 1.65 ft higher. Oct. 1, 1940, to Mar. 31, 1942, nonrecording gage at present site and datum. Prior to Oct. 30, 1967 and Nov. 9, 1999 to Oct. 29, 2002, auxiliary water-stage recorder at mouth of Copperas Creek, 8.0 mi downstream.

REMARKS.-- Occasional regulation at low flow by navigation dams at Peoria and La Grange. Since Jan. 17, 1900, flow has included diversion from Lake Michigan through Chicago Sanitary and Ship Canal.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 88,800 ft³/s, Dec. 7, 1982, gage height, 23.86 ft; maximum gage height, 26.02 ft, May 25, 1943; minimum daily discharge, 600 ft³/s, Oct. 26, 1997, estimated, caused by dam regulation.

DISSOLVED OXYGEN: Maximum recorded, 17.8 mg/L, May 7,2005, but may have been higher during periods of missing record; minimim recorded, 3.2 mg/L, Oct. 9, 2004, but may have been lower during periods of missing record.
PH: Maximum recorded, 9.2, Sept. 23-24, 26-28, 2004; minimum recorded, 7.2, June 9 and Nov. 18, 2004.

SPECIFIC CONDUCTANCE: Maximum recorded, 1100 MS/cm, Feb. 11-12, 2005; minimum recorded, 504 MS/cm, July 8, 2004.

WATER TEMPERATURE: Maximum recorded, 29.7°C, July 14, 2004; minimum recorded, 0.1°C, Dec. 23, 2004 and Jan. 23, 2005.