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The system was renamed the McAlpine Locks and Dam in 1960 in honor of William McAlpine, who was the only civilian to have ever served as district engineer for the Corps of Louisville. At present, the normal pool elevation is 420 feet (130 m) above sea level and the drainage area above the dam is 91,170 square miles (236,000 km 2 ).
The program's purpose was to replace the system of outdated wicket dams and small locks. The new dams were non-navigable and made of concrete and steel. Each dam has two adjoining locks, one 600-foot by 110-foot chamber, and a 1,200-foot by 110-foot chamber to accommodate fifteen barges that can lock through in one maneuver. [2]
File talk: Coast Guard buoy tender Obion entering main lock at McAlpine Locks, 1999, Ohio River mile 607 (99a043).jpg
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The locks can be filled or emptied in around 8 minutes. The upper pool is normally at an elevation of 383.0 feet (116.7 m), mean sea level and the lower pool elevation is 358.0 feet (109.1 m), mean sea level. The lift (difference) between the two pool is 25 feet (7.6 m). 25 million US gallons (95,000 m 3) of water is required to operate the lock.
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