Hey PDs,
Despite what it looks like, the Mississippi River Paddlewheelers were amazingly stable. They had a very wide beam to length ratio, flat bottom and shallow draft. Though many of them were lost to the perils of travelling the "Old Man" I cannot recall a single one capsizing, though there may have been those that did. Boiler explosions, hitting snags, hitting each other, fires (the bales of cotton were more likely to be ignited by embers from the smokestacks) were common factors contributing to the losses of Mississippi riverboats. In the book The Mississippi Steamboat Era in Historic Photographs by Gandy and Gandy ISBN 0-486-25260-4, the riverboat Arkansas City was even hit by a tornado. Even though it was damaged beyond repair, it did not capsize.
Randy