Below is a complete listing of all Ohio Historical Markers. To find a detailed marker listing including text, photographs, and locations, click on a county below. Our listing is updated by the markers program as new markers are installed and older markers are reported damaged or missing.
Side A: The Ohio River floodwaters account for Portsmouth’s settlement. Alexandria, the county’s first town, was laid out in 1799 on the west bank of the Scioto at its confluence with the Ohio. Early settlers in Alexandria were forced to higher ground across the river in Portsmouth because of frequent flooding. As a result, Portsmouth, platted in 1803, became Scioto County’s seat and business center by 1814. Prominent local industries included brick, stone, steel, wood products, and shoe manufacturing. As of 2003, the Ohio River is the cornerstone of Portsmouth’s transportation system, providing a means for materials to reach destinations throughout the region. It also serves as a recreation hub. The three-mile long levy, first built in 1908, failed in the 1937 flood and was subsequently improved.