Never fished Flatiron but hear its fishing slow right now according to DOW. It was just stocked last week as well as Pinewood right above it. I think there are just mostly rainbows in there with some suckers, browns, cuts, and brookies. If fishing is slow try Pinewood by the boat dock or in Fisherman's Cove. Powerbait, worms, and minnows are work well but sometimes those fish are hard to hook. You can use the same pass for both lakes that is purchased by the Carter Lake entrance.