The lake depends on snow and rain (and some springs) to keep the water level up. The red line is the lake level average from 8/23/13 to 12/31/15 in feet from an arbitrary starting point of 0 feet. The cyan line is the lake level average from 2/27/16 to 10/7/18. The 4/12/19 level is at 2.38 feet. The magenta line is the average lake level from the end of 2018 to the end of 2019 (John went through the ice to get the year-end level). Note that the lake at the end of the year was at 1.9 feet which was right at the average for the year.
The red hexagons show the level of the lake sometime in April each year. One can see the level is a bit lower in the last 5 years. I’m not sure if this is statistically significant. It will bare watching over the next couple of years.
[Thanks to John Hayden for measuring the level every week.]