
The Columbia River forms the northern boundary of this territory, where early 20th-century irrigation efforts began transforming the arid landscape. Evidence of these massive water projects is visible through the Oregon Land and Water Co Canal, the Furnish Ditch, and the creation of the Cold Springs Reservoir, which sits adjacent to the Cold Springs Bird Reservation. These engineering works supported growing settlements like Hermiston and Stanfield along the Umatilla River.
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