I am pretty sure the trout do carry over, used to see people catch pretty decent size trout in the one pit, I doubt they stock them that big in there. The pits are pretty deep so the trout have plenty of cold water.
As others have said the fish are there, caught alot in the spring and summers, but for some reason a hard place to ice fish, years ago I tried it a few times and got the skunk, I can only assume the fish were in the deeper water, but I wasn't about to go over the deepest water with the way the ice looked.