I've only fished it in the winter, so I'm not sure
I don't have any bathymetry for this lake, either.
Perhaps someone else will chime in
It isn't a very big lake, so it would be pretty easy to move a couple of times.
If you really want your boy to catch a fish, and aren't too picky about the type of fish, I would try Pine Coulee Reservoir (which is just west of Stavely). It doesn't open until May 21st, however. The walleye are (typically) easy to catch while sitting on the dock (using a piece of smelt and a jig head). My boy caught his first fish out there, and now he's "hooked."