I also agree that it is a large Gizzard Shad. At the spillway on pool 6 last week I snagged two that were easily over 16″ long. They get very large, you just rarely see those individuals, as they seem to spend their adult life in very deep water, and though they are considered omnivores I believe, they tend to be more synonymous with benthivores and would would be unlikely to take most of the offerings that we would happen to be using in the kinds of depths and current that they seem to like to inhabit.