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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The program's purpose was to replace the system of outdated wicket dams and small locks.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]
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.
Science Research Associates Inc. was founded in 1938 [1] with a trade and occupational focus. In 1957, it moved into individualized classroom instruction with the iconic SRA Reading Laboratory Kit, a format that they translated to mathematics, science, and social studies [1] commonly called SRA cards. [2]
HAER No. WI-47, "Upper Mississippi River 9-Foot Channel, Lock & Dam No. 4, Alma, Buffalo County, WI", 118 photos, 12 data pages, 7 photo caption pages; HAER No. WI-48, "Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau, Trempealeau County, WI", 79 photos, 9 data pages, 5 photo caption pages
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The main scale reading is that to the left of the zero on the vernier scale. The vernier reading is found by locating the best aligned lines between the two scales. The 0.02 mm engraving indicates the caliper's readability and is the "vernier constant" for this scale.