Yes, I guess, and the actual year was 1916. I just looked it up. These “insurance boundaries” 100-year flood, 200-year flood, 500-year flood aren’t set in concrete. They are estimates. Also, population growth changes the runoff typography that probably in many cases renders those “boundaries” moot. These river flood plains in Appalachia are where most towns are built. They are going to flood at some point in their history no matter how many dams & watershed projects you build. A storm will come along some day that all that civil engineering can’t handle. That’s just reality.
Where I live the flood markers are obvious in the rolling hills of wheat. We actually had our “100” year flood about 5 years ago, unless a glacier comes crashing down from Canada because the Artic melted overnight, I’m good.