
Little Porcupine Creek and its various forks define this portion of Valley County, where the high plains transition into a complex drainage system. This 1983 provisional survey highlights the intricate land divisions across townships T32N, T31N, and T30N, reflecting a landscape dominated by ranching and open range. Remote infrastructure is sparse, yet the presence of an Airstrip in the western reaches suggests the necessity of aerial access in this expansive Montana terrain. The confluence of the West Fork Spring Valley Fork and East Fork Spring Valley Fork provides a clear view of the natural watercourses that have historically shaped land use and navigation in the Fort Peck Indian Reservation area.
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This is the sole edition of this map. No revisions or reprints were ever made.
1910 · Todd Lakes
USGS Topo · 1:62,500
1915 · Todd Lakes
USGS Topo · 1:62,500
1915 · Spring Creek
USGS Topo · 1:62,500
1954 · Wolf Point
USGS Topo · 1:250,000
1954 · Glasgow
USGS Topo · 1:250,000
1957 · Glasgow
USGS Topo · 1:250,000
1958 · Wolf Point
USGS Topo · 1:250,000
1958 · Glasgow
USGS Topo · 1:250,000
1973 · Larslan
USGS Topo · 1:24,000
1973 · Haugens Hill
USGS Topo · 1:24,000