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The Willamette River is a tributary to the Columbia River, and enters the Columbia at River Mile (RM) 101. It provides the Columbia with approximately 15 percent of its annual discharge. The mouth of the Willamette lies just downstream of Hayden Island, Oregon, and provides the southern shore of Sauvie Island.
From the Cowlitz the next course of the Columbia is SE. 2/3 S. for 27 miles to the mouth of the Willamette river (A corruption of the Indian name. This stream is the Multnomah of Lewis and Clark.), about 16 miles above the Cowlitz.