The walls of this lock are 6’wide at the top and 12 ‘ wide at the bottom which is anchored into the bedrock. It is the only operating lock in the system with this style. Fortunately for us, Kaukauna Lock 5’s original construction somehow avoided the limestone block upgrade and retains the original stacked stone construction style. At that time, locks were rebuilt with quarried limestone blocks and concrete. Stacked Stone construction was the earliest method of building the Fox River Locks and was used until the Army Corps of Engineers took over management in the 1880s. We are lucky to have an amateur historian on staff, and these are excerpts from Scott Thompson’s greater research into the system. The Fox Locks pre-date the Civil War, so there is a large body of historical information on the system.
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