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Peak Streamflow for the Nation

USGS 05587450 Mississippi River at Grafton, IL

Jersey County, Illinois
Hydrologic Unit Code 07110009
Latitude  38°58'04.7", Longitude  90°25'44.4" NAD83
Drainage area 171,300  square miles
Gage datum 403.79 feet above NGVD29

Period of record
Begin Date End Date Peaks
1844-06 2021-04-14 36

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