Chattanooga Engineers Club
Joint program with IEEE Chattanooga
Chickamauga Lock Project Update
Monday, September 13, 2021
The Chickamauga Lock Replacement Project includes design and construction of a replacement 110-foot by 600-foot navigation lock to be located downstream of Chickamauga Dam on the Tennessee River in Chattanooga, Tenn., and riverward of the existing lock.
The Chickamauga Lock Replacement Project is located at Mile 471 of the Tennessee River in eastern Tennessee.
BACKGROUND: The project includes design and construction of a replacement 110-foot by 600-foot navigation lock to be located downstream of the dam and riverward of the existing lock. Replacement lock construction began in 2004 with highway and utility relocations and continued through 2012 with the completion of the cofferdam structure and prefabricated components that are currently being stored at other Tennessee Valley Authority (TVA) facilities until needed. After a temporary suspension of construction activities due to funding constraints with the Inland Waterways Trust Fund (IWTF), construction resumed after funding returned to the project in FY15.
IMPORTANCE: A new lock is required at Chickamauga Dam because of structural deficiencies of the existing lock resulting from physical expansion of the concrete structure. This phenomenon of concrete growth was observed soon after initial construction in 1940 and is caused by a reaction between the alkali in the cement and the aggregate. Even with significant maintenance efforts, this expansion threatens the structural integrity of the existing lock and limits its life.
The $240 million Lock Chamber contract includes 13 total options; four options have been exercised through FY18 valued at approximately $95.7 million (exercised options are 22 percent complete).
Adam Walker, P.E., PMP
Project Manager, Chickamauga Lock ReplacementProject Delivery Section
U.S. Army Corps of Engineers Nashville District
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