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LOCATION.-- Lat 41°47'14", long 89°40'35" (NAD of 1927), in SW1/4SE1/4 sec.22, T.21 N., R.7 E., Whiteside County, Hydrologic Unit 07093005, on concrete wall at mouth of Hennepin Feeder Canal, 300 ft upstream of the Upper Rock Falls Dam, and at mile 73.6. |
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DRAINAGE AREA.-- 8,740 mi2.(revised WRD IL-75-1). |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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STAGE: October 2003 to current year. |
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GAGE.-- Water-stage recorder and phone telemeter. Datum of Gage is 630.00 ft above NGVD 1929, based on elevation provided by Illinois Department of Natural Resources. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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STAGE: Maximum gage height, 6.88 ft, Dec. 22, 2003; minimum 5.45 ft, Jan. 8, 2004. |
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Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |