As a "fond farewell" prank from my cousins at the diving bell, on my last day of work in 1983 season I was, with much ceremony, tossed into Lake Silver from the wharf area. Did a flip on the way down, and when I landed in the water about 10 feet out my boots came to rest on...CONCRETE. I don't know how much of the lake has concrete in it as a liner, but at least part of it does. I would still LOVE to see the photo from the old, old, days.