Big Zig,
I've been fishing Blue Marsh very hard the past 3 years. There's alot of crappies in there, mostly 8-9" white crappies, but there are also alot of really nice ones in there too. My biggest was a 15 3/4" black crappie from 2 years ago. I haven't fished the Speedwell for quite a few years and I've never fished Maunch.
Rick