Doc, 6"-12" rock makes a great structure. I considered rip-rap in my lake but decided the cost was more than I wanted to spend. However, I have created several rock piles going from shallow to deeper water and marked them accordingly on shore above the water line. I am not so sure this might not work just as well as having the entire dam rocked for this reason, I have fished alot of lakes with rip-rap and you can go for great distances sometime between fish. When you do find them they are usually concentrated around some unique feature, such as a sudden change in depth, a patch of grass, an area of larger or smaller rocks or even rocks making a very subtle point within the other rocks. My point is fish like something about the piece of structure to be different than just a solid shore of evenly spaced rocks.
