I've never heard of smelt being in there, but I believe they've stocked all sorts of stuff in there over the years. I'm pretty sure the deepest hole is 70 ft in an area called the fingers, but most of the lake is shallow(15-30ft), although there are quite a few good spots where there is a steep drop, right off the shoreline rocks. There's no doubt it would be worth trolling early spring after it's stocked.
I think it may be good for trolling in the right spots. The deepest part is called the fang its out near camp carpenter on the manchster side. There are also some deep holes 40ft or so in the main body near the massabesic traffic circle. Be careful though there are a few unmarked reefs and big rocks.
thanks foer all the replies sorry about typos Im typing fast at waork