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In the spring of 1970, the Museum of Northern Arizona contracted with Arizona Public Service Company to provide archaeological investigations for the Navajo Project 500kV Southern Transmission Lines from Page to Phoenix, Arizona. The right-of-way, 330 feet wide and approximately 256 miles long, crossed four major environmental zones - plateau, mountain, transition, and desert - and portions of five prehistoric culture areas. Eighty-eight sites were recorded along the line, 20 of which were excavated. The excavated sites included two Kayenta Anasazi sites located in the northern portion of the transect, four Cohonina sites in the Williams-Flagstaff vicinity, two others of Cohonina affiliation near Prescott, nine atop Perry Mesa in the central part of the state, and three of Hohokam-like appearance below Perry Mesa toward Phoenix. The research in all five geographical culture areas was directed toward defining the ecological relationships between prehistoric peoples and their environments. Of particular interest were the investigations in the Cohonina and Perry Mesa areas, and a vessel function study which aided in inferring site organization and economy in all the culture areas. As all the sites excavated were small, the vessel study substantially supplemented the conclusions regarding site function derived from other analyses.