Exact(6)
In addition to being widened, the canal will double its capacity with two new sets of locks.
Two sets of locks facilitate the passage, but they also impose a limit; for decades, the shipping industry's standard has been the Panamax ship, the largest one that could fit through the locks.
Several sets of locks lift vessels about 60 feet up to Manchester, where the canal's terminus was built.
As there are separate sets of locks for upstream and downstream traffic, this system is more water efficient than bi-directional staircase locks.
Congressional approval for the Upper Minneapolis Harbor Development Project came in 1937 but it wasn't until 1950 through 1963, that the United States Army Corps of Engineers constructed two sets of locks at the lower dam and at the falls.
Four additional sets of locks lie further inland, 600 feet long and 65 feet wide and 350 feet by 45 feet for the smaller lock; each has a rise of approximately 15 feet.
Similar(54)
"There were 10 or 11 sets of locked doors between us and the outside," remembers Alston.
An unemployment call center near Mr. Oursler, for instance, now sits behind two sets of locked doors and frosted windows.
Five sets of locked doors close behind you as you enter the inner rings of the prison.
Past him, through two sets of locking metal doors that seal shut one after another, Sgt. Beth Ehren often puts in a 16-hour day at Central Control.
-- past the security guards, past the sign reading "no cameras or image-capturing devices," through two sets of locked doors -- designers sketch cars on computers and race them in three-dimensional form, silent as phantoms, around the room.
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