
Lockhart sits at the southern edge of a desert basin where local ranching history meets the arid expanse of the Mojave Desert. The landscape is dominated by the dry bed of Harper Lake, a terminal playa that forms the centerpiece of Harper Valley. This area reveals the stark intersection of natural topography and human infrastructure, with roads like Lockhart Rd and Lockhart Ranch Rd delineating the early settlement patterns of the high desert. To the east, the terrain transitions into the distinct landforms of Water Valley and the rugged incision of Black Canyon. The survey maps out the grid-like township and range system, showing the precise sections that shaped land ownership in this corner of San Bernardino County. Researchers can trace the layout of the small community of Lockhart and its relationship to the surrounding valley floor and the approach to Black Canyon Rd.
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This is the sole edition of this map. No revisions or reprints were ever made.
1915 · Searles Lake
USGS Topo · 1:250,000
1932 · Barstow
USGS Topo · 1:125,000
1934 · Barstow
USGS Topo · 1:125,000
1947 · Trona
USGS Topo · 1:250,000
1948 · Trona
USGS Topo · 1:250,000
1953 · San Bernardino
USGS Topo · 1:250,000
1953 · Trona
USGS Topo · 1:250,000
1955 · Opal Mountain
USGS Topo · 1:62,500
1956 · San Bernardino
USGS Topo · 1:250,000
1956 · Fremont Peak
USGS Topo · 1:62,500