Avalon, PA, United States
Davis Island Lock & Dam. 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; repla
ced by the nearby Emsworth Locks and Dams in 1922.
Listen to the audio guide for Blue plaque № 28347 Free on WIP — starts by itself when you arrive, even with the screen off