Napoleon
Desha County, United States · built 1830
Napoleon was a river port and the county seat of Desha County, Arkansas, from 1838 to 1874. It was located at the confluence of the Arkansas and the Mississippi rivers. Napoleon was badly damaged during the Civil War and then finally abandoned after most of it had washed into the Mississippi River.
Port data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).