Flatboats were the most prolific type of vessel on the Ohio and Mississippi Rivers during the early 1800s. By the late 1800s, however, flatboats had completely dis?appeared, and no intact examples were known to exist. Our knowledge of these historic vessels had been limited to illustra?tions, memoirs, and traveler accounts. That changed in 2000 after local residents found a wreck on the Ohio River shoreline in Il?linois. Archaeologist Mark J. Wagner...