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Streamflow Measurements for the Nation


05587500 Mississippi River at Alton, IL
Madison County, Illinois
Hydrologic Unit Code 07110009
Latitude  38°53'06", Longitude  90°10'51" NAD27
Drainage area 171,500  square miles
Gage datum 403 feet above NAVD88
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Graph of streamflow measurement data at USGS 05587500 Mississippi River at Alton, IL
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