Boone Dam Seepage Remediation

On January 7, 2016, TVA issued a final Environmental Assessment (EA) and Finding of No Significant Impact (FONSI) for the construction activities to remediate seepage at Boone Dam, as well as the associated drawdown of the reservoir water levels. The environmental review of the proposed fix to the dam, located on the border between Sullivan and Washington Counties, Tennessee, helped TVA identify, avoid and mitigate potential environmental effects of the proposed project. 

The EA analyzes the effects of our proposal to fix the dam by building a composite seepage barrier from the crest of the dam’s earthen embankment into the foundation soils and bedrock. 

The barrier would consist of an injected grout curtain and an excavated and filled concrete diaphragm wall. As part of the proposal, TVA would use lands managed by us near the dam for construction support activities and would continue the reservoir drawdown through construction. The remediation could take between five and seven years.

On October 28, 2015, TVA released a draft EA for public review and accepted comments through November 30th. During the review period, TVA hosted a public meeting in Johnson City to present its findings and solicit input. TVA considered all comments that were received during the review period.  These comments and TVA’s responses are included in an appendix to the final EA.

TVA also completed a review of how the project complies with the White House Council on Environmental Quality’s policy established in Principles and Requirements for Federal Investments in Water Resources (March 2013).  TVA conducted a review of the principles, requirements, and guidelines for water resources investments (PR&G Review) consistent with the Federal Interagency Guidelines issued in June 2015. The PR&G Review document is available below.       

For more information on the Boone Repair project, please visit the Boone Repair website or email

Related Documents


For more information about the environmental review contact:

Matthew Higdon
NEPA Specialist
400 West Summit Hill Drive, WT 11D
Knoxville, TN 37902