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- Chart|width=400|height=100|xAxisTitle=Year|yAxisTitle=Average Secchi Depth [feet]|legend=|colors=red,lightblue,orange |y1Title=Annual|y2Title=Winter|y3Title=Summer|type=line
|x=1968,1969,1970,1971,1972,1973,1974,1975,1976,1977,1978,1979,1980,1981,1982,1983,1984,1985,1986,1987,1988,1989,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016,2017,2018,2019,2020,2021,2022,2023
|y1=102.4,93.8,99.1,94.2,89.9,85.6,89.2,85.6,89.9,91.2,85,87.6,81.4,89.9,79.7,73.5,74.8,79.4,79.1,80.7,81,77.4,77.4,73.5,78.4,70.5,74.1,70.5,76.8,64,65.9,68.9,67.3,73.5,78.1,70.9,73.5,72.2,67.6,70.2,69.6,68.2,64.3,68.9,75.1,70.2,77.8,73.2,69.2,60.4,70.9,62.7,63.0,61.0,71.9,68.2
|y2=109.6,119.1,99.4,109.9,85.6,96.8,97.4,94.5,90.6,91.2,87.6,95.1,90.9,81.7,90.6,95.1,72.2,89.6,88.3,76.1,77.4,87.6,84.6,70.9,72.5,84.6,71.5,75.1,88.3,65.6,76.1,81,70.5,77.8,78.4,70.9,83.3,80.4,76.8,82.3,85.3,81.4,72.8,85,88.3,77.8,79.1,71.5,83.3,78.7,73.5,81.0,64.0,71.9,72.2,91.9
|y3=94.2,74.8,93.5,86.3,91.2,75.1,83,77.8,84.6,92.8,82,81.7,74.8,97.8,64.6,57.1,74.5,72.5,74.1,85.6,91.9,75.5,75.5,72.8,82.7,65.3,77.8,58.1,69.2,62.7,59.7,63,64,72.8,81,69.2,73.2,66.9,57.4,65.3,50.5,59.1,51.8,51.5,64.6,63.6,76.8,73.2,56.4,53.5,61.7,52.8,59.1,54.8,68.9,53.5 (en)
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