Tecopa Pass serves as a central geographical marker in this high-desert region of San Bernardino County, where the landscape is defined by the broad expanse of California Valley and the rising elevations of the Alexander Hills. In the early 21st century, the area remains largely defined by its remote outpost character and legacy of desert activity, anchored by the locations of Upper Noonday Camp and Lower Noonday Camp. These sites, along with the isolated Tule Spring, suggest a history of seasonal or mining-related habitation typical of the Mojave transition. Transportation through this arid basin is facilitated by Mesquite Valley Rd and Co Hwy 20545, which trace the low-lying drainage patterns across the valley floor, connecting the camps and springs that provided essential resources in an otherwise demanding environment.
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1910 · Ivanpah
USGS Topo · 1:250,000
1912 · Ivanpah
USGS Topo · 1:250,000
1933 · Avawatz Mountains
USGS Topo · 1:250,000
1942 · Ivanpah
USGS Topo · 1:250,000
1947 · Trona
USGS Topo · 1:250,000
1947 · Kingman
USGS Topo · 1:250,000
1948 · Kingman
USGS Topo · 1:250,000
1948 · Trona
USGS Topo · 1:250,000
1950 · Tecopa
USGS Topo · 1:62,500
1951 · Tecopa
USGS Topo · 1:62,500