This report summarizes a 3-year study of eolian sedimentary processes in the Colorado River corridor, Grand Canyon National Park, Ariz., and discusses the relevance of those processes to the preservation of archeologic sites. The results reported here are based on detailed sedimentologic and geomorphologic investigations in three reaches of the river corridor, as well as continuous measurements of wind, rainfall, and sand transport at six sites for as long as 26 months, short-term field study at 35 other sites, examination of historical aerial photographs, and review of data collected and analyzed during previous studies.