A field evaluation of pavement sections containing cement-treated bases with and without fly ash was undertaken at the University of Wyoming. The study was conducted using historical data from Wyoming Transportation Department (WTD) construction documents and field performance data collected with the WTD road profiler. Pavement performance models were first developed on the basis of the physical attributes of the sections. Another analysis was also conducted to determine if the performance of sections with fly ash in the base was statistically different from the performance of sections without fly ash.