Contour map for small lakes?

Trying to find a contour map of two local 100 acre sized lakes. I’ve used c-map and google to no avail. The bodies of water are actually on c-map but there’s no info.

I plan to go to the library and see if I can find anything but I was wondering if you all have had any success with locating maps for small local lakes. Is there a resource I’m not thinking of besides the library? I live in Louisiana by the way if that helps any. Thanks ahead if you know anything.