Center Hill Dam Safety Rehabilitation Project
As of 10/31/2013, the Center Hill Dam Trip is Full.
Friday, December 6, 8 a.m.-1 p.m.
Background: Center Hill Dam is located in DeKalb County, Tennessee, 27 miles above the mouth of the Caney Fork River, a major tributary to the Cumberland River. The Center Hill project was designed and built in the 1940s providing the important benefits of flood-damage reduction, hydropower, recreation, water supply, and water quality. The project has a main dam consisting of a 1,400-foot-long concrete section and an 800-foot-long rolled-earth embankment. A second 125-foot-high, 800-foot-long earthen saddle dam lies within the right rim. Center Hill Lake impounds a maximum of 2,092,000 acre-feet.
The problem: Since construction, foundation seepage problems have cost millions of dollars in monitoring, subsurface investigation, and grouting expenses. Seepage problems stem from the original foundation treatment methods and the karst geology on which the main and saddle dam embankments are founded.
The solution: In 2005, Center Hill was classified in the U.S. Army Corps of Engineers’ dam safety action classification (DSAC) as DSAC 1, the highest priority for remediation. The Nashville District obtained approval in late 2006 to begin a major rehabilitation of the foundation, which includes pumping grout into the foundation, as well as a modern concrete barrier wall. The current construction effort will install a barrier wall through the earthen embankment of the main dam and anchor into competent rock. Construction is estimated to be completed in 2015. A roller compacted concrete reinforcing berm is planned for the saddle dam starting in 2014, with a projected completion date of 2016.
The tour: A 15-minute group orientation will take place prior to departure. Participants are advised to wear season-appropriate clothing and comfortable walking shoes.
You must preregister by November 8: As this is a federal project, due to the timeframe needed for security review/clearance, you must preregister by November 8. U.S. citizens will be required to provide full names and SSN or driver’s license number. Foreign nationals will be required to provide full names and complete passport information. Participation is limited to 40; registrations will be processed on a first come, first served basis.