1927 Map of Aguila Mountains

About this map

San Cristobal Valley dominates this 1927 survey, showing the arid expanse of Yuma County before modern irrigation and development transformed the region. The landscape is primarily defined by the wide alluvial basin and the distinct topographic contours of the surrounding mountains. A primary artery through this desert terrain is Yager Road, which strikes diagonally across the valley floor, connecting the scattered township and range markers that organized this portion of the Arizona territory. Mapping efforts were overseen by T. G. Gerdine and conducted by surveyors Bishop Moorhead and C.N. Mortenson, documenting a period when the state was still formalizing its water rights under officials like Frank P. Trott. The map serves as a primary record of the natural desert drainage patterns and the early transportation routes that preceded the modern highway system.