
The Musselshell River winds through the heart of this landscape, anchoring a network of water management centered on the Deadmans Basin Reservoir. The interplay between natural waterways and engineered irrigation is evident in the Deadmans Basin Supply Canal and the Deadmans Basin Outlet Canal, which redirect water across the valley floor. Settlement is concentrated in the small communities of Shawmut and Barber, both positioned near the river.
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1889 · Big Snowy Mountain
USGS Topo · 1:250,000
1893 · Big Snowy Mountain
USGS Topo · 1:250,000
1954 · Roundup
USGS Topo · 1:250,000
1958 · Roundup
USGS Topo · 1:250,000
1985 · Locomotive Butte
USGS Topo · 1:24,000
1985 · Progress
USGS Topo · 1:24,000
1985 · O'Brien Hill
USGS Topo · 1:24,000
1986 · Ryegate West
USGS Topo · 1:24,000
1986 · Shawmut
USGS Topo · 1:24,000
1986 · Halbert Creek South
USGS Topo · 1:24,000