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Rock Island County

rockisland county map Map legend and scale


Low elevation: <540 feet above mean sea level
      Place: Mississippi River
      7.5' quadrangle name: Blanchard Island
      PLSS: 4-34-16N-6W
      Geology: Cahokia Alluvium in river valley

High elevation:>810 feet above mean sea level
      Place: Unnamed hilltop
      7.5' quadrangle name: Reynolds
      PLSS: 4-31-16N-2W
      Geology: Illinoian Kellerville till upland

Area: 447.32 square miles
      Total relief (approximate): 270 feet
      Average percent slope: 1.50


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Updated 5/7/2007 JKH