- Location: Counce, Tennessee
- Owner: Tennessee Valley Authority
- Engineer(s): GEI Consultants, Inc.
- Contract Type: Fixed Unit Price (competitive bid)
- Status: Currently under construction
After a 2014 analysis of the Pickwick Landing Dam showed that the dam’s south embankment could face potential damage in a larger seismic event, Tennessee Valley Authority (TVA) started making plans to stabilize the south embankment to meet dam safety criteria. Built during the 1930s, the Pickwick Landing Dam was constructed to produce hydroelectricity, provide flood control, and improve the navigability of the Tennessee River. As part of this project, Barnard is performing work on the upstream and downstream portions of the dam, including construction of large buttresses and extended fills.
The downstream portion of the project includes dewatering; excavation; performing instrumentation modifications; constructing manholes, catch basins, and a new toe drain; filter placement; fill placement; and placing riprap for slope stabilization. Prior to performing excavation on the downstream side of the dam, Barnard must dewater the soils while complying with TVA’s requirements for drilling in embankments. To complete this, Barnard is drilling and installing deep wells using sonic drilling methods. Work on the upstream portion of the dam consists of constructing a large rock berm and extended fill in the wet from barges in water depths up to 30 feet. Overall, this project requires more than 1.8 million tons of import fill, sand, aggregate, and large rockfill materials.