Until Mike has a chance to get on and reply, here's what he wrote in his 2014 Fishing Prospects (these are available at: http://fishing.mdc.mo.gov/ ):

Truman will continue to be one of the best crappie hot spots in the Mid-west. This year expect a lot of fish between nine and ten inches. Fall sampling found lower numbers of large fish than in recent samples. There are plenty of big crappie out there but expect fewer than what has been out there the last few years. Crappie fishing is excellent throughout the lake. In general the further upstream you go in the lake, you’ll catch more big fish.