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Henry County


henry county map Map legend and scale


Low elevation: <560 feet above mean sea level
      Place: Rock River
      7.5' quadrangle name: Coal Valley
      PLSS: 4-19-17N-1E
      Geology: Cahokia Allumium, river valley

High elevation:  >875 feet above mean sea level
      Place: Unnamed hilltop
      7.5' quadrangle name: Kewanee South
      PLSS: 4-1-14N-4E
      Geology: Loess hill over thin Illinois Glasford till over Pennsylvanian Carbondale Formation

Area: 817.22 square miles
      Total relief (approximate): 315 feet
      Average percent slope: 1.11%


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Updated 5/4/2007 JKH