As others have said, the lakers seem to be mostly from Hell Creek east to the dam. I can't speak on the burbot as the only ones I have caught on Peck were by accident while targeting walleye and pike.
Your best bet is to call Clint at the Hell Creek Marina, Scott at the Fort Peck Marina, or Eddie at Lakeridge. They can point you in the right direction and give you current ice condition reports.