Wolf Creek Dam
JAMESTOWN, Ky. — A drilling unit operates on the work platform at Wolf Creek Dam in Jamestown, Ky., as a tour group with Nashville Mayor Karl Dean stands in the background Aug. 8, 2012. A barrier wall is being installed to stop seepage in the karst geology deep below in the embankment.

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Photo by: Lee Roberts |  VIRIN: 120808-A-CE999-002.JPG