Interesting, but Sad story. Carp (Crap) had been moving up the MS toward Chicago for several years, alerts were send out and locals campaigned for closing the navigation water between the lakes and lower rivers, i.e, the MS. But in the end, Political and Industrial/Business interest prevailed. Seems blocking Crap would have redistricted commercial barge traffic between the MS and the Lakes. So, now we/they live with it....