
Holmes Gap and the Eola Hills anchor the northern landscape of this Willamette Valley region, where drainage patterns define the rural character. This environment is characterized by a complex network of seasonal and permanent waterways, including Baskett Slough, Mud Slough, and Rickreall Cr, which feed toward the Willamette River on the eastern boundary. The presence of numerous small-scale water management features like Marx Reservoir and Eagle Crest Reservoir reflects the agricultural demands of the fertile plains.
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1914 · Independence
USGS Topo · 1:31,680
1915 · Rickreall
USGS Topo · 1:31,680
1915 · Eola
USGS Topo · 1:31,680
1915 · Sidney
USGS Topo · 1:31,680
1917 · Salem
USGS Topo · 1:62,500
1922 · Airlie
USGS Topo · 1:31,680
1924 · Mc Minnville
USGS Topo · 1:48,000
1926 · Mc Minnville
USGS Topo · 1:62,500
1940 · McMinnville
USGS Topo · 1:62,500
1940 · Salem
USGS Topo · 1:62,500