Davis Island Lock & Dam

Allegheny County · dedicated 1987 · 1050 Ohio River Blvd. (PA 65) at E borough line, at Eat 'n' Park, Avalon

Below this bridge was the first lock and dam built (1878-1885) on the Ohio River. This was the world's largest movable dam yet constructed, and included the world's first rolling lock gate and widest lock chamber. Built and operated by the U.S. Army Corps of Engineers; replaced by the nearby Emsworth Locks and Dams in 1922.

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David Rumsey Map Collection, Stanford Libraries

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under a mile from where William Gabby lived in the 1760s

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Marker data: Pennsylvania Historical and Museum Commission via data.pa.gov

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