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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 ).
They determined that building a system of locks and dams to form pools was the best solution to the problem. Following the opening of the lock and dam at Davis Island in 1885, the venture proved to be worthy. In 1910, the Rivers and Harbors Act was authorized by Congress. The Act allowed the production of a system of locks and dams along the Ohio.
The Louisville and Portland Canal was a 1.9-mile (3.1 km) [1] canal bypassing the Falls of the Ohio River at Louisville, Kentucky.The Falls form the only barrier to navigation between the origin of the Ohio at Pittsburgh and the port of New Orleans near the Gulf of Mexico; circumventing them was long a goal for Pennsylvanian and Cincinnatian merchants. [2]
A plan and side view of a generic, empty canal lock. A lock chamber separated from the rest of the canal by an upper pair and a lower pair of mitre gates.The gates in each pair close against each other at an 18° angle to approximate an arch against the water pressure on the "upstream" side of the gates when the water level on the "downstream" side is lower.
Situated thirty-two miles downstream from the city of Pittsburgh, Pennsylvania, this lock and dam system has two locks, one for commercial barge traffic that is 600 feet long by 110 feet wide, and the other, which is a recreational auxiliary lock that is 360 feet long by 56 feet wide.
HAER documentation of individual locks and dams: HAER No. MN-21, "Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 3, Red Wing, Goodhue County, MN", 98 photos, 11 data pages, 7 photo caption pages; HAER No. MN-22, "Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 5, Minneiska, Winona County, MN", 92 photos, 11 data ...
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The main lock is 110 feet (33.5 m) wide by 600 feet (182.9 m) long and like most other sites in the project, it has a smaller, unfinished, auxiliary lock. [2] In 2004, the facility was listed in the National Register of Historic Places as Lock and Dam No. 13 Historic District, #04000173 covering 2,542 acres (10.3 km 2 ), 1 building, 6 ...