These vessels are used on the river to replace and maintain navigational buoys. Because of the constant fluctuation of the Ohio River, the buoys and other navigational aids require rather constant maintenance.
Did you also know that the Ohio River is unique amongst other rivers on how the mile markers are laid out. On the Ohio, the mile markers start with the headwaters and move downstream. In all other rivers the mile markers run "upriver" from the mouth....Odd, yet interesting fact
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