Photograph as originally submitted to this page in the Historical Marker Database www.HMdb.org. Click on photo to resize in browser. Scroll down to see metadata.

Photographer: Keith L
Taken: July 24, 2008
Caption: Lock & Dam No. 4 - Alma, Wisconsin Sign
Additional Description: Constructed and Operated by the
Army Corps of Engineers; St. Paul District
One of 29 Navigation Locks Between Minneapolis, MN and St. Louis, MO
Miles above St. Louis: 752.8
Maxium Lift: 7 Feet
Lock Chamber: 110 X 600 Feet
Dam Length: 1367 Feet
Original Construction Completed: 1935
Major Rehabilitation Completion: 2003
Miles Above Lock & Dam No. 5: 14.7
Miles Below Lock & Dam No. 3: 44.2
The pool created by the dam at Lock No. 4 is the longest in river miles (44.1) on the Mississippi River. Pool 4 also contains Lake Pepin which is the only natural lake in the channel of the Mississippi River.
Submitted: March 23, 2009, by Keith L of Wisconsin Rapids, Wisconsin.
Database Locator Identification Number: p56878
File Size: 0.492 Megabytes

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