This project examined the potential impacts that construction of the Western Transmission System of the Allen-Warner Valley Energy System would have on the ethnographic and historic resources of the Mojave Desert area. The Western Transmission System of the Allen-Warner Valley Energy System project consisted of two 500-kilovolt transmission lines extending from Southern California Edison Company’s Eldorado Substation in southern Nevada westward across the Mojave Desert to Lugo Substation in Victorville, California. The ethnographic component of this study included the identification of culturally affiliated Native American groups and extensive field investigations which focused on ethnohistory and ethnogeography of the study area. The ethnographic study also documented Native American recommendations for mitigation by Southern California Edison Company of potential adverse impacts that the project had on Native American values and resources.