
NG MTA FT WM Henry Harrison dominates the northeastern corner of this Montana landscape, where the urban edge of Helena West Side meets the foothills of the Boulder Mountains. The terrain transitions from the developed corridors along Blue Cloud Rd and Priest Pass Rd into the high country of the Helena National Forest. Several small airfields, including Ten Mile Airport and Duncan Airport, are situated near Tenmile Creek, reflecting the importance of light aviation in the valley below the mountains.
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1889 · Helena
USGS Topo · 1:250,000
1893 · Helena
USGS Topo · 1:250,000
1899 · Boulder
USGS Topo · 1:125,000
1899 · Helena
USGS Topo · 1:62,500
1899 · Helena
USGS Topo · 1:250,000
1903 · Helena
USGS Topo · 1:250,000
1947 · Butte
USGS Topo · 1:250,000
1950 · Jefferson City
USGS Topo · 1:62,500
1950 · Helena
USGS Topo · 1:62,500
1954 · Basin
USGS Topo · 1:62,500