The United States of America Estados Unidos Mexicanos international border defines the southern landscape of this 2015 study area in Imperial County, California. This arid region, characterized by the Imperial Valley and the sandy expanse of East Mesa, is dominated by major water management and transportation corridors. The All-American Canal cuts a distinct horizontal line across the center of the map, serving as a critical artery for irrigation in this desert environment. Above the canal, two primary transit routes, Interstate 8 and State Route 98, traverse the terrain, illustrating the modern infrastructure that connects this borderland to the broader California interior. The map clearly delineates township and range lines, such as t16s r17e and t17s r18e, providing a precise grid of the public land survey system in this sparsely settled frontier.
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This is the sole edition of this map. No revisions or reprints were ever made.
1907 · Holtville
USGS Topo · 1:125,000
1940 · Alamorio
USGS Topo · 1:62,500
1940 · Calexico
USGS Topo · 1:62,500
1942 · El Centro
USGS Topo · 1:250,000
1943 · Calexico
USGS Topo · 1:62,500
1945 · Alamorio
USGS Topo · 1:62,500
1953 · Calexico
USGS Topo · 1:50,000
1954 · El Centro
USGS Topo · 1:250,000
1954 · Midway Well NW
USGS Topo · 1:24,000
1954 · Glamis SE
USGS Topo · 1:24,000