
Sauvie Island and the confluence of the Columbia River and Willamette River anchor this topographic survey. The landscape transitions from the river-bottom lakes like Sturgeon Lake and Mouse Island Lake to the agricultural plains and foothills west of Portland. A dense network of early 20th-century transportation defines the region, including the Spokane Portland and Seattle Railway and the Oregon Electric Railway, which served burgeoning communities such as Hillsboro, Orenco, and North Plains.
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