 Sullivan was to be criticized later for not extending the line all the way to the similarly named (but different) Des Moines Rapids on the Mississippi River at about the latitude of Fort Madison, Iowa.Sullivan was to begin his survey on the "far bank" of the confluence on the Left Bank of the Missouri at what is now the Clay County, Missouri and Platte County, Missouri line at what is now property owned by Kansas City Downtown Airport.The mark that now forms the Iowa-Missouri border was placed just north of Sheridan, Missouri.