| Layers: |
Predevelopment Potentiometric Contours (feet)(1)
January, 1934 Potentiometric Contours (feet)(2)
July, 1961 Potentiometric Contours (feet)(3)
May, 1980 Potentiometric Contours (feet)(4)
May, 1990 Potentiometric Contours (feet)(5)
May, 1995 Potentiometric Contours (feet)(6)
May, 2000 Potentiometric Contours (feet)(7)
May, 2010 Potentiometric Contours (feet)(8)
May, 2012 Potentiometric Contours (feet)(9)
September, 2012 Potentiometric Contours (feet)(10)
May, 2013 Potentiometric Contours (feet)(11)
September, 2013 Potentiometric Contours (feet)(12)
May, 2014 Potentiometric Contours (feet)(13)
September, 2014 Potentiometric Contours (feet)(14)
May, 2015 Potentiometric Contours (feet)(15)
September, 2015 Potentiometric Contours (feet)(16)
May, 2016 Potentiometric Contours (feet)(17)
September, 2016 Potentiometric Contours (feet)(18)
May, 2017 Potentiometric Contours (feet)(19)
September, 2017 Potentiometric Contours (feet)(20)
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