The Scioto River ( ) is a river in central and southern Ohio more than in length. It rises in Hardin County just north of Roundhead, Ohio, flows through Columbus, Ohio, where it collects its largest tributary, the Olentangy River, flows south into Appalachian Ohio, and meets the Ohio River at Portsmouth. Early settlers and Native Americans used the river for shipping, but it is too small for modern commercial craft. The primary economic importance for the river now is for recreation and drinking water. It is the longest river that is entirely within Ohio.
The Scioto River is represented on the Ohio state seal and coat of arms.
The geologic history of the Scioto River is tied to the destruction of the Teays River network during the Ice Ages and consequent creation of the Ohio River. The north flowing Teays River was dammed by glaciers, and damming of other rivers led to a series of floods as lakes overflowed into adjacent valleys. Glacial Lake Tight is estimated to have been two-thirds the size of modern Lake Erie. Valleys beyond the reach of glaciers were reorganized to create the Ohio River, and the Scioto River replaced the Teays River. The Scioto River flows through segments of the Teays River valley but opposite the direction the Teays River flowed. In the cities of Columbus and Dublin, the river has cut a gorge in fossil-bearing Devonian limestone, and many tributary streams have waterfalls, such as Hayden Falls.
During the antebellum years, the Scioto River provided a route to freedom for many slaves escaping from the South, as they continued north after crossing the Ohio River. Towns such as Chillicothe became important stops on the Underground Railroad.
A traditional fiddle tune in the Appalachian repertoire, “Big Scioty”, takes its name from the river. The melody is attributed to the Hammons family of West Virginia.
In 2012, the river dropped to record- or near-record-low water levels as a result of the acute effects of the 2012 North American drought in Ohio.
The removal of the Main Street Dam in downtown Columbus, which was built in 1921, began in November 2013. The $35.5 million removal project was initially proposed in the 2010 Strategic Plan for downtown Columbus and was funded by a coalition of public and private entities. Prior to its demolition, the Main Street Dam impounded roughly of the Scioto River, artificially enlarging its width to an average of in downtown Columbus. Once completed, the Scioto Greenways project will reduce in width by nearly half, and expose of land which will be reclaimed as parkland by the city. Riffles and pools will be restored to the river channel, returning it to its natural riparian state. Experts believe the restoration project will result in a healthier river and better habitat for native plant, fish, and mussel species.
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