
The Columbia River serves as the central artery for this 1916 survey, dividing the high plateaus of Oregon and Washington. This era was defined by the competing interests of water and rail, with the Oregon-Washington RR & Nav Co and the Spokane Portland & Seattle railroads flanking the river. Hazards like the Owyhee Rapids and Blalock Rapids illustrate the challenges of river navigation before the age of major dams, while the Oregon Trail remains visible as it skirts south of the Willamette Base Line.
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