Sacagawea River winds through the heart of this central Montana landscape, creating a distinct topographical corridor within Petroleum County. The river's path is defined by sharp elevation shifts, illustrating the characteristic drainage patterns of the high plains. This 2020 record focuses on a largely undeveloped stretch of the river, documenting the intersection of natural waterways and modern land management systems. The map details the precise alignment of the riverbed and the surrounding terrain, serving as a contemporary baseline for researchers monitoring the shifts in Montana’s high-plains watercourses.
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This is the sole edition of this map. No revisions or reprints were ever made.
1954 · Lewistown
USGS Topo · 1:250,000
1959 · Lewistown
USGS Topo · 1:250,000
1965 · Dry Coulee
USGS Topo · 1:24,000
1965 · Chain Buttes
USGS Topo · 1:24,000
1965 · Weingart Place
USGS Topo · 1:24,000
1965 · Weingart Place NW
USGS Topo · 1:24,000
1971 · Hanson Flat
USGS Topo · 1:24,000
1984 · Zortman
USGS Topo · 1:100,000
1985 · Kirkendal Flat
USGS Topo · 1:24,000
1985 · Brown Spring
USGS Topo · 1:24,000