LOCATION.-- Lat 39°55'09", long 88°48'09" (NAD of 1927), in SE1/4NE1/4 sec.24, T.17 N., R.3 E., Macon County, Hydrologic Unit 07130006, near center of span on downstream side of bridge, 2.4 mi downstream from Friends Creek, 3 mi north of Oakley, and about 4.5 mi upstream from Lake Decatur. | |
DRAINAGE AREA.-- 774 mi2. | |
PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE | |
DISCHARGE: October 1951 to September 1977 (fragments), no low-flow records since September 1956. | |
REVISED RECORDS.-- WDR IL-75: Drainage area. | |
GAGE.-- Nonrecording gage. Datum of gage is 603.00 ft above NGVD of 1929 (levels by Warren & Van Praag, Inc.). | |
REMARKS.-- Medium and low flows affected by operation of gates at Lake Decatur Dam. | |
EXTREMES FOR PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 16,000 ft3/s June 23, 1974, gage height, 18.40 ft, from graph based on gage readings; maximum gage height, 18.85 ft May 9, 1961, from graph based on gage readings; minimum not determined. | |
EXTREMES OUTSIDE PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Flood of May 18 or 19, 1943, reached a stage of 21.85 ft, from floodmark, discharge not determined. | |