
The Willamette River meanders through this portion of the Willamette Valley, defining a landscape of complex waterways and fertile lowlands near the beginning of the 21st century. The river's course creates significant landforms including Ingram Island, Dodge Island, and Morgan Island, with several secondary channels like Perkins Slough and Flat Creek weaving through the agricultural fields. The city of Harrisburg serves as the primary hub, situated along the eastern bank where the river bends south toward Lancaster.
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1909 · Harrisburg
USGS Topo · 1:31,680
1909 · Rowland
USGS Topo · 1:31,680
1909 · Elmira
USGS Topo · 1:62,500
1910 · Eugene
USGS Topo · 1:62,500
1911 · Monroe
USGS Topo · 1:31,680
1911 · Inavale
USGS Topo · 1:31,680
1912 · Halsey
USGS Topo · 1:62,500
1922 · Monroe
USGS Topo · 1:62,500
1922 · Elmira
USGS Topo · 1:62,500
1939 · Monroe
USGS Topo · 1:62,500