
The origin of the 102 River is a mistake in the initial map of Missouri’s northern border with Iowa when Missouri became a state in 1821. The northern border was supposed to be exactly 100 miles north of the confluence of the Missouri and Kansas Rivers at what became Kansas City. However, surveyors made errors in marking that area, so the border extended 10 miles farther into Iowa (which would have made what is now Clarinda, Iowa, part of Missouri).









