USACE The dam consists of a concrete structure 1,357 feet long with six roller gates and 22 Tainter gates. The movable dam has six roller gates (20 feet high by 60 feet long), 18 non-submersible Tainter gates (15 feet high by 35 feet long), and four submersible Tainter gates (15 feet high by 35 feet long). Completing the dam system is an earthen embankment approximately 5,500 feet long, located between the movable dam and high ground on the Minnesota side of the river. The dam foundation consists of piles in sand and gravel. The lock was put in operation in May 1935. At the time it was built, the dam's combination of roller and Tainter gates was believed to have been the first of its type to be constructed. Cold weather created several problems during construction of the complex. Approximately 120 timber pilings split and had to be pulled and replaced; engineers speculated that sap freezing in the green pilings may have caused the splitting. Ten major injuries, 296 minor injuries, and three deaths were reported during the construction of the dam. The pool created by Lock and Dam 4 is the longest in river miles (44.1 miles) with the largest water area of all the Mississippi River pools in the St. Paul District. It encompasses Lake Pepin, which was formed in geologic time by sediment deposited in the Mississippi River at the mouth of Wisconsin’s Chippewa River. The lake is 22 miles long and up to 2.5 miles wide. It is the only natural lake in the Mississippi River’s main channel. |
Faith Camp shared Sam Schropp The picture above isn't a current [Spring, 2019] picture. The dams are wide open from Lock 2 to Mel Price at Alton. |
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John Weeks III |
Marilyn Schack Hulse posted Alma, Wisconsin, Monday, April 13, 2020, with Lock & Dam 4 in the background. |
Dennis DeBruler commented on Marilyn's post Thanks for labeling the dam. I like that as well as the train. It looks like all of the gates are all the way up. So the river is currently running rather high. It is still well below the flood stages. |
USACE posted six photos with the comment: "THEN AND NOW: On this date in 1932, the St. Paul District awards a contract to the Ouilmette Construction Company for the construction of a lock at Lock and Dam 4 in Alma, Wisconsin. More: http://ow.ly/oPex50LkvJ0"
Steven Bruni shared
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USACE, St. Paul District posted three photos with the comment:
Eighty-nine years ago in May 1935, the St. Paul District completes the construction of Lock and Dam 4 in Alma, Wisconsin, and Lock and Dam 5 in Minnesota City, Minnesota.Pictured: construction on Lock and Dam 4 from 1934.
Lloyd Scott Harding shared
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Davy Crockett commented on the above post April 25, 2023 |
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