Boone Dam project still projected to be completed in 2022, reaches three-year milestone

Johnson City Press • Updated Jul 10, 2018 at 5:37 PM

Three years ago this month, Tennessee Valley Authority officials began repairing the seepage issue on Boone Dam’s earthen embankment. 

According to a TVA press release issued Tuesday, major construction completed this fiscal year includes the berm project that aims to provide additional stability to the embankment. Workers have placed 220,000 tons of locally-sourced rock along the upstream and downstream sides of the berm.

TVA officials said the Boone Dam seepage remediation project is still projected to be completed in 2022, the original estimate set on July 30, 2015. The budget for the project still remains at an upward of $450 million.

TVA expects to announce a new contractor in the fall as it is considering bids for the underground cutoff wall.

Since the beginning of the project in December 2015 workers have:

• Worked 791,456 total work-hours.

• Placed 220,000 tons of rocks on upstream and downstream berms.

• Drilled and grouted 539 low mobility grout holes to seal larger subsurface areas and 261 high mobility grout holes to fill smaller voids within the earthen embankment.

• Drilled a total of 113,511 linear feet, or 21.51 miles.

• Placed 2,388 cubic yards of grout, or approximately 239 truckloads of concrete.

Next steps include pre-cutoff wall construction this summer; removing the large monopole at the top of the concrete dam; preparing the concrete dam for the cutoff wall; installing a monitoring system for the cutoff wall; and creating additional storage areas, or laydown yards, for construction materials. 

For more information on the Boone Dam Project, visit www.TVA.com



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