Detailed map of the region Surveyed by the United States Topographical Engineers in connection with the explorations and surveys in search of the most practicable route for a railroad to the Pacific Ocean.
The map notes a number of earlier explorer's routes, including Cooke's Emigrant Route, Emory (1846) and Whipple (1853).
The route begins in the El Paso and Fillmore area and tracks the Proposed Railroad Route through the Sierra Madre Mountains and the Suerra Caliente Mountains, along the Gila River, ending in the Vicinity of Maricopa Wells, in the modern day area of Phoenix.
A number of Wagon Roads are shown in Southern Arizona and Southern New Mexico, along with the missions in Tucson and San Xavier de Bac.
To the east of Tucson, Gold Placers are noted.