I saw this dam last year on July 4 th, 2006. I was on my way to Fontana Dam to shoot some photos there. You obviously took this photo from the highway bridge.
Dams this size are not common in Nebraska where I come from. I have friends on Watts Bar Lake. This dam is rather intimidating in appearance. Sort of gives one the willies if you aren't looking for it from the highway. Your picture gives me the same sense of impending doom!
No, some are in NC. This is Cheoah Dam, where they shot the "Dam" scene in the movie The Fugitive with Harrison Ford. It is just 3 miles across the TN/NC border in NC.