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Chickamauga Lock Replacement

Addressing structural concerns caused by alkali-aggregate reactivity

  • Chatanooga, Tennessee

    Chatanooga, Tennessee

Developing concepts, designs, schedules, and cost estimates for a replacement lock at Chickamauga Dam

The Chickamauga Lock Replacement Project is at Mile 471.0 on the Tennessee River at Chattanooga, Tennessee. Chickamauga Lock & Dam consists of 4,390 feet of earthfill embankments, a 111-megawatt powerhouse with four units, an 860-foot-long concrete spillway section with 18 gates, and a 60- by 360-foot navigation lock. The lock, owned by the Tennessee Valley Authority and operated and maintained by the US Army Corps of Engineers, was dedicated for service in 1940.

The alkali-aggregate reactivity in the lock concrete structures causes continued expansion of the concrete. This leads to high stresses, cracking of the concrete, and movement of the concrete structures. Ultimately, it results in increased maintenance and heightened concern about the structural integrity. In support of the USACE Nashville District and the TVA, we performed studies of innovative concepts that could reduce costs and increase performance of the replacement lock. Ideas included roller-compacted concrete lock walls, integrated lock walls with permanent cofferdams, float-in guide walls, and an efficient filling system.

Our team also prepared decommissioning plans for the existing lock, which involved a closure structure concept design and structural measures to manage the AAR growth issue long-term. In the end, we consolidated the work of multiple engineering consultants to prepare final plans, bid specifications, construction schedule, and probable cost estimates for the project.

At a Glance



  • Power & Dams - Construction Management
Meet Our Team

Michael Newbery , Senior Vice President, Energy

My goals as a leader are to collaborate with clients, work with the project team, lead by example, and deliver projects safely and successfully—all while having fun.
Michael  Newbery Senior Vice President, Energy Read More

Chander Sehgal , Senior Vice President, Energy

The variety of projects I work on, the leadership role I play, and the seriousness and depth with which I engage myself helps make every day interesting and enjoyable.
Chander Sehgal Senior Vice President, Energy Read More

Michael  Newbery

Senior Vice President, Energy

Chander Sehgal

Senior Vice President, Energy

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