I had a breach in March. It covered entire dam and over 4' on lower side. I panicked and thanks to friends like ewest and Todd I was eased (a little). Covered pier 5-6'. Carried a 3/4" plywood (treated 8x16') tent floor a quarter mi. 5" limestone rock held, lost some roadbase. All in all was NOT nearly as bad as first thought. This was 8" in 6 hrs.
Good luck central Tx. Pond Meisters.
ps Bullheads a problem now! 400 Plus caught/trapped since March!