What is the deepest gorge in the U.S. east of the Rockies?

Several claim this distinction, including Tallulah Gorge in northeast Georgia, Alabama's Little River Canyon, and the Breaks Interstate Park on the Kentucky-Virginia border. However, I believe it is Linville Gorge in the North Carolina mountains.

I agree Coldfuse.Some sites claim that "Little river canyon" is the deepest at 600 feet,this site says that " Linville gorge" is 1600-2000 feet deep.

Having hiked up and out of the Linville Gorge several times at Table Rock, my legs will tell you it's at least that deep