McCulloughs Spring and Josephine Spring provide rare water sources in this high-elevation basin within the Mountain Boy Range. The 2012 topography is defined by significant vertical relief, extending from Swiss Mountain and Modoc Peak in the north to Castle Mountain in the south. Centrally, the Spring Valley Summit marks a critical transition point for local routes like the Spring Vly road, which traverses the rugged terrain between Spanish Mountain and Atrypa Peak.
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1926 · Roberts Mountains
USGS Topo · 1:250,000
1929 · Roberts Mountains
USGS Topo · 1:250,000
1953 · Pinto Summit
USGS Topo · 1:62,500
1953 · Eureka
USGS Topo · 1:62,500
1955 · Millett
USGS Topo · 1:250,000
1956 · Bellevue Peak
USGS Topo · 1:62,500
1956 · Whistler Mtn
USGS Topo · 1:62,500
1956 · Ely
USGS Topo · 1:250,000
1959 · Ely
USGS Topo · 1:250,000
1959 · Millett
USGS Topo · 1:250,000