FWIW, this lake is 365 acres with a max depth of 32'. I'd say average depth is between 12 and 15'. Lots of shallow areas 10' and less. Muck bottom with some sand. It's over 100 years old, and could be over 200 years old.

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[Linked Image from lh6.ggpht.com]
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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).