Although decreased funding and increased environmental regulations have put the brakes on new dam construction in the United States, dam safety remains a crucial concern. Many dams, especially earthen embankment dams constructed prior to 1960, do not meet today’s higher hydraulic design criteria . Hydrologically deficient, these earthen dams were simply not designed to safely store or pass at least one-half the calculated probable maximum flood. As engineers search for cost-effective ways to rehabilitate deficient embankment dams, more and more of them are discovering the value of roller-compacted concrete (RCC) overlays.