I fished Pickett Lake for a few hours several years ago, but I didn't have fly tackle along and just spin fished it. We caught several rainbows and I was surprised to get a few as large as 15 or 16 inches. I don't know how well they hold over, but the lake is cold and seems pretty deep on the bottom end, so I'd think it has potential to hold some larger fish.
I'd like to go back some day and give it a closer look, though I've never really had much experience with stillwater fly fishing for trout.
bd