Thornhill Butte rises as a prominent landmark in this section of Phillips County, presiding over a landscape defined by deeply etched drainage systems and high plains ridges. The road network connects the small outpost at DY Junction to the surrounding terrain via Landusky Rd and Power Plant Ferry Rd, reflecting the sparse but deliberate transit patterns of the Montana prairie. Numerous coulees, including Coyote Coulee and Hay Coulee, segment the land, while Bell Ridge and Siparyann Ridge provide topographic contrast. Water management is evident at Phillips Reservoir, which captures flow from Cottonwood Cr, while several other ephemeral streams like Bull Cr, Siparyann Cr, and Duval Cr navigate the complex elevation changes. The presence of the CMR Auto Nature Tour Rd in the southern portion suggests the area's significance for wildlife observation and public land access within the local ecology.
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This is the sole edition of this map. No revisions or reprints were ever made.
1943 · Landusky
USGS Topo · 1:125,000
1954 · Bell Ridge East
USGS Topo · 1:24,000
1954 · Bell Ridge West
USGS Topo · 1:24,000
1954 · Grand Island
USGS Topo · 1:24,000
1954 · Lewistown
USGS Topo · 1:250,000
1959 · Lewistown
USGS Topo · 1:250,000
1971 · Crazyman Coulee
USGS Topo · 1:24,000
1971 · Hays
USGS Topo · 1:24,000
1971 · Hays SE
USGS Topo · 1:24,000
1971 · Zortman
USGS Topo · 1:24,000