Upper Mississippi River 9-Foot Channel, Lock & Dam No. 4, Alma, Buffalo County, WI

Significance: This lock and dam was the first constructed as part of the Upper Mississippi River Nine-Foot Channel Project. It contains the standard items on most of the lock and dam structures in this project, including the lock and movable section which includes roller and Tainter gates.

Survey number: HAER WI-47

Building/structure dates: 1932- 1938 Initial Construction

Building/structure dates: 1958 Subsequent Work

Building/structure dates: 1966 Subsequent Work

Building/structure dates: 1967 Subsequent Work

Building/structure dates: 1968 Subsequent Work

Building/structure dates: 1969 Subsequent Work

Building/structure dates: 1972 Subsequent Work

Building/structure dates: 1981 Subsequent Work

Building/structure dates: 1983 Subsequent Work

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1969 - 1980

Library of Congress

http://www.loc.gov/

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