
Helena and the industrial corridors of the Missouri River anchor the western edge of this 1947 compilation, where the transition from valley floor to the high timber of the Helena National Forest is sharply defined. The map records a critical era for the region's water infrastructure, capturing the presence of the Canyon Ferry Dam and the Hauser Dam, which transformed the river into a sequence of reservoirs including Canyon Ferry Lake and Lake Helena.
99 named features on this map. Tap any name to fly to it.
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This is the sole edition of this map. No revisions or reprints were ever made.
1886 · Great Falls
USGS Topo · 1:250,000
1886 · Fort Logan
USGS Topo · 1:250,000
1886 · Little Belt Mts.
USGS Topo · 1:250,000
1888 · Three Forks
USGS Topo · 1:250,000
1889 · Big Snowy Mountain
USGS Topo · 1:250,000
1889 · Helena
USGS Topo · 1:250,000
1890 · Fort Benton
USGS Topo · 1:250,000
1891 · Livingston
USGS Topo · 1:250,000
1891 · Big Timber
USGS Topo · 1:125,000
1892 · Fort Benton
USGS Topo · 1:250,000