Three Hundred Dam and Demontigny Dam mark this high-latitude borderlands landscape in Phillips County, just south of the international boundary between Montana and Saskatchewan. The terrain is defined by a sparse network of secondary roads and drainage systems, where small water management structures like these dams were essential for supporting ranching and agricultural operations in an arid environment. The road network, including Sunny Slope Rd, follows a strictly rectangular grid, reflecting the systematic land division of the American West as it persisted into the early 21st century. This map captures the intersection of local water infrastructure and the geometric order of the northern plains, showing a region where human modification is focused almost entirely on capturing surface runoff for livestock and irrigation.
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This is the sole edition of this map. No revisions or reprints were ever made.
1920 · Avery
USGS Topo · 1:125,000
1920 · Cowan
USGS Topo · 1:125,000
1953 · Havre
USGS Topo · 1:250,000
1954 · Glasgow
USGS Topo · 1:250,000
1957 · Glasgow
USGS Topo · 1:250,000
1957 · Havre
USGS Topo · 1:250,000
1958 · Glasgow
USGS Topo · 1:250,000
1958 · Havre
USGS Topo · 1:250,000
1984 · Morgan
USGS Topo · 1:24,000
1984 · Loring NW
USGS Topo · 1:24,000