Chickamauga Lock Replacement Project

The Chickamauga Lock Replacement Project is a federally funded undertaking by the US Army Corps of Engineers Nashville District to replace the existing 110-foot by 600-foot navigation lock with a new lock of the same size. The new lock will be located on the Chattanooga River in Tennessee.

CPC is a subcontractor to The RLS Group on the Chickamauga Lock Replacement Project. We are supporting the 3D laser scanning and deliverable portion of the project. Our initial phase is to scan the trench walls and tunnels to verify construction meets the design tolerances.

3D laser scanning is a non-contact, non-destructive technology that uses lasers to create digital 3D representations of physical objects. It is a highly accurate and efficient way to measure and document existing conditions. On the Chickamauga Lock Replacement Project, we will use 3D laser scanning to create detailed 3D models of the trench walls and tunnels. These models will then be used to compare the actual construction to the design plans and specifications.

3D laser scanning offers a number of benefits for construction projects, including:

• Improved accuracy: 3D laser scanning is a highly accurate technology that can measure objects to within a fraction of an inch. This can help to identify and correct any construction errors early on, before they become costly and time-consuming to fix.
• Increased efficiency: 3D laser scanning can quickly and efficiently collect data from large areas. This can save a significant amount of time and labor costs.
• Improved communication: 3D models can be used to communicate complex design concepts to stakeholders and team members. This can help to improve collaboration and coordination on the project.

CPC is committed to helping ensure that the new Chickamauga Lock is built to the highest standards of quality and accuracy.

Notes: 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 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 fiscal year (FY) 2015. 

• The $245 million Lock Chamber contract awarded to Shimmick Construction Company, Inc., in September 2017 is currently 40% complete; the current contract required completion date of Sept. 28, 2023, is at risk due to slower than anticipated concrete placement rates.
• The $61 million Upstream Approach Wall contract was awarded to C.J. Mahan Construction Company, LLC in September 2021, with contract completion scheduled for January 2024.    
• The Corps will complete a Cost and Schedule Risk Analysis (CSRA) and Total Project Cost Estimate (TPCE) update this year (required every two years).

This is a federal project that we are starting this week.  We are a subcontractor to The RLS Group.  We will be supporting the 3D laser scanning and deliverable portion of the project.  This initial phase is to scan the trench walls and tunnels to verify construction meets the design tolerances.