Roller-compacted concrete (RCC) has become a popular method for providing spillway and overtopping protection for earthen dams. Over the past 27-years, RCC has been used as a spillway or overtopping protection for more than 130 dams. In addition to providing protection from erosive forces of flowing water, several of these projects are located in areas exposed to numerous freeze-thaw cycles. Operation frequency of RCC spillways and overtopping protection projects ranges from serving as principal spillways to frequencies less than the 500-year flood event. However, most RCC overtopping protection structures are emergency spillways designed to operate at a frequency not exceeding the 100-year storm.