I don't understand why they don't pave the #$% trail. Look at (some) of the surrounding states, IA, IL and AR. Missouri is so far behind as far as bicycles are concerned. I should know I've lived here for 48 years. Lucky folks up near Des Moines got it made. They don't know what they have!
Some of the trail is in the floodplain. Much of it is not, including the additions they are making in the future. Asphalt or concrete it. Everybody else is doing it.