Lowest and Highest Points in Mason County


Mason County map Map legend and scale
Low elevation: <435 feet above mean sea
      level

      Place: Illinois River
      7.5' quadrangle name: Clear Lake
      PLSS: 3-5-19N-11W
      Geology: Cahokia Alluvium in river valley

High elevation: >730 feet above mean sea
      level

      Place: 2 unnamed hills along a ridge
      7.5' quadrangle name: Easton
      PLSS: 3-25-20N-7W
      Geology: Parkland sand ridges (esker?)

Area: 557.44 square miles
      Total relief (approximate): 295 feet
      Average percent slope: 0.54%



High/Low Home


Updated 05/27/2011 SLD

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