Fairmont Hot Springs and the surrounding mountain valley define this landscape at the border of Deer Lodge and Silver Bow counties. The high-desert terrain is marked by a complex network of water management and natural drainage, including the Yellow Ditch and the winding course of Silver Bow Creek. Small settlements and historic junctions like Crackerville, Gregson, and Opportunity are linked by Old Hwy 10A, reflecting the corridor's long-standing role as a vital transit route between regional centers.
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1889 · Helena
USGS Topo · 1:250,000
1893 · Helena
USGS Topo · 1:250,000
1893 · Dillon
USGS Topo · 1:250,000
1899 · Helena
USGS Topo · 1:250,000
1903 · Helena
USGS Topo · 1:250,000
1947 · Butte
USGS Topo · 1:250,000
1955 · Dillon
USGS Topo · 1:250,000
1957 · Dillon
USGS Topo · 1:250,000
1958 · Butte
USGS Topo · 1:250,000
1958 · Dillon
USGS Topo · 1:250,000