
The Columbia River serves as a stark dividing line between Washington and Oregon in this mid-1970s orthophotoquad. This unique perspective, produced by the Geological Survey in cooperation with the U. S. Corps of Engineers, utilizes aerial imagery from 1975 to provide a literal view of the landscape rather than a traditional line-drawn map. The densely developed residential grids of Portland extend south toward the volcanic cinder cone of Mount Tabor, while the north shore shows the growth of Vancouver. The expansive footprint of Portland International Airport dominates the Oregon riverfront, illustrating the critical role of the river corridor in the region's transportation and aviation infrastructure during this period of Pacific Northwest urban expansion.
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This is the sole edition of this map. No revisions or reprints were ever made.
1897 · Portland
USGS Topo · 1:62,500
1905 · Portland
USGS Topo · 1:62,500
1911 · Boring
USGS Topo · 1:48,000
1914 · Boring
USGS Topo · 1:62,500
1914 · Oregon City
USGS Topo · 1:62,500
1916 · Estacada
USGS Topo · 1:125,000
1918 · Troutdale
USGS Topo · 1:62,500
1934 · Troutdale
USGS Topo · 1:48,000
1939 · Oregon City
USGS Topo · 1:62,500
1940 · Boring
USGS Topo · 1:62,500