The Jacumba Mountains define this high desert border region, where early 21st-century infrastructure follows the paths of 20th-century pioneers. The settlement of Jacumba sits near the southern edge of the sheet, while the remnant paths of Old Highway 80 and several critical rail sidings trace the challenging landscape. Significant engineering is evident along the Carrizo Gorge, including Tunnel Fifteen Spur and Carrizo Gorge Siding, markers of the San Diego and Arizona Railway heritage. From the McCain Valley in the west to Dos Cabezas in the northeast, the map reveals a terrain punctuated by desert springs like Camp Sizzle Spring and prominent peaks such as Mount Tule and Gray Mountain. These landmarks provided essential navigation and water for travelers crossing between the Jacumba Valley and the deeper desert reaches.
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This is the sole edition of this map. No revisions or reprints were ever made.
1931 · Carrizo
USGS Topo · 1:125,000
1939 · Campo
USGS Topo · 1:62,500
1939 · Jacumba
USGS Topo · 1:62,500
1942 · Campo
USGS Topo · 1:62,500
1942 · Carrizo Mtn
USGS Topo · 1:62,500
1942 · Jacumba
USGS Topo · 1:62,500
1942 · Cuyapaipe
USGS Topo · 1:62,500
1950 · San Diego
USGS Topo · 1:250,000
1954 · San Diego
USGS Topo · 1:250,000
1955 · San Diego
USGS Topo · 1:250,000