A few facts
Facts about the Montgomery Island Dam on the Ohio River:
Location: 32 miles downriver from Pittsburgh.
Built: The dam was built from 1932 to 1936 and cost about $5.7 million. The locks opened in June 1936. The dam replaced three old-style wooden wicket dams that had been built by the U.S. Army Corps of Engineers in the late 1800s and early 1900s. The purpose of those dams was to raise the first shallow navigational pool on this stretch of the Ohio River.
Length: 1,379 feet.
How it works: Montgomery Locks and Dam has a gated dam, which permits increased control over the water level upriver of the dam. Machinery mounted on tall concrete piers moves large chains, which lift gates that are hinged into the body of the piers. As the gates are raised or lowered to control the amount of water flowing under them, the upstream pool is maintained at a relatively constant level.
Traffic: About 20 million tons of freightpass through annually.
Source: U.S. Army Corps of Engineers