For back then, the Ohio River was one of the transport routes for coal that was ultimately shipped to Europe. This was part of the 1947-48 interim aid program where the U.S. sent food, medicine and coal to help war-devastated Austria, Italy and France. These supplies were desperately needed by the three countries so they could survive the winter before the Marshall Plan recovery program kicked in.
Yesterday, on a sunny day in Cincinnati, a barge moved along the Ohio River transporting coal. If you had a time machine, you might have seen the same occurrence happen on a winter or spring day in 1947 or early 1948.