
The Willamette River meanders across the southern landscape of this region, defining the borders between Marion, Yamhill, and Clackamas counties. Higher elevations like Parrett Mtn and Ladd Hill provide a counterpoint to the low-lying Onion Flat and the wetlands preserved within the Tualatin River National Wildlife Refuge. The settlement pattern reflects deep roots in the Willamette Valley, with established centers at Sherwood, Tualatin, and Wilsonville connected by historical transport corridors like the Portland & Western RR.
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This is the sole edition of this map. No revisions or reprints were ever made.
1914 · Oregon City
USGS Topo · 1:62,500
1916 · Tualatin
USGS Topo · 1:62,500
1923 · Mount Angel
USGS Topo · 1:62,500
1939 · Molalla
USGS Topo · 1:62,500
1939 · Oregon City
USGS Topo · 1:62,500
1939 · Tualatin
USGS Topo · 1:62,500
1940 · Tualatin
USGS Topo · 1:62,500
1940 · Molalla
USGS Topo · 1:62,500
1940 · Mount Angel
USGS Topo · 1:62,500
1941 · Oregon City
USGS Topo · 1:62,500