Water level contour maps:
01_02con.pdf -- Water level contours, January 2002
07_02con.pdf -- Water level contours, July 2002
** Data not available ** -- Water level contours, January 2003
07_03con.pdf -- Water level contours, July 2003
01_04con.pdf -- Water level contours, January 2004
07_04con.pdf -- Water level contours, July 2004
01_05con.pdf -- Water level contours, January 2005
07_05con.pdf -- Water level contours, July 2005
01_06con.pdf -- Water level contours, January 2006
07_06con.pdf -- Water level contours, July 2006
01_07con.pdf -- Water level contours, January 2007
07_07con.pdf -- Water level contours, July 2007
01_08con.pdf -- Water level contours, January 2008
07_08con.pdf -- Water level contours, July 2008
01_09con.pdf -- Water level contours, January 2009
07_09con.pdf -- Water level contours, July 2009
01_10con.pdf -- Water level contours, January 2010
07_10con.pdf -- Water level contours, July 2010

These are 11x17 inch format color maps.