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. |
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DRAINAGE AREA.-- 774 mi2. |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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DISCHARGE: October 1951 to September 1977 (fragments), no low-flow records since September 1956. |
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REVISED RECORDS.-- WDR IL-75: Drainage area. |
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GAGE.-- Nonrecording gage. Datum of gage is 603.00 ft above NGVD of 1929 (levels by Warren & Van Praag, Inc.). |
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REMARKS.-- Medium and low flows affected by operation of gates at Lake Decatur Dam. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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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. |
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EXTREMES OUTSIDE PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Flood of May 18 or 19, 1943, reached a stage of 21.85 ft, from floodmark, discharge not determined. |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |