Drag the middle of the vertical bar left/right to see ground surface to water surface differences
Use the Left and Right drop-down menus to change the years of data to be compared, then click GO.
Use the sliders under the drop-down menus to change opacity of the layers.
Left
1970
1975
1980
1985
1990
1995
2000
2005
2010
2011
2012
2013
2014
2015 Spring
2015 Fall
2016 Spring
2016 Fall
2017 Spring
2017 Fall
2018 Spring
2018 Fall
2019 Spring
2019 Fall
2020 Spring
2020 Fall
2021 Spring
2021 Fall
2022 Spring
2022 Fall
2023 Spring
2023 Fall
GO
1970
1975
1980
1985
1990
1995
2000
2005
2010
2011
2012
2013
2014
2015 Spring
2015 Fall
2016 Spring
2016 Fall
2017 Spring
2017 Fall
2018 Spring
2018 Fall
2019 Spring
2019 Fall
2020 Spring
2020 Fall
2021 Spring
2021 Fall
2022 Spring
2022 Fall
2023 Spring
2023 Fall
Right
0
1
0
1