
The Imperial Valley landscape is defined by an intricate network of irrigation channels and drainage ditches that support this agricultural powerhouse. The Alamo River snakes through the center of the sheet, surrounded by a geometric grid of laterals and drains named after plants and geographic markers, such as the Oak Lateral, Osage Lateral, and Orchid Lateral. Small settlements and junction points including Alamorio, Orita, and Sandia serve as the primary human hubs within this highly engineered environment. The infrastructure is anchored by major works like the Holtville Main Drain, which manage water flow across the desert floor. This grid-heavy layout reveals the intensive land management required to sustain farming in the region, with roads like Silliman Rd and Taecker Rd following the water lines to connect the scattered communities of Curlew and Moss to the wider valley.
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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
1915 · El Centro
USGS Topo · 1:125,000
1940 · Brawley
USGS Topo · 1:62,500
1940 · Iris
USGS Topo · 1:62,500
1940 · Alamorio
USGS Topo · 1:62,500
1942 · El Centro
USGS Topo · 1:250,000
1943 · Brawley
USGS Topo · 1:62,500
1944 · Calipatria
USGS Topo · 1:62,500
1945 · Alamorio
USGS Topo · 1:62,500
1945 · Iris
USGS Topo · 1:62,500