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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.
Willamette Meridian. The Willamette Meridian was established in 1851, and extends from the Canadian border to the northern state line of California. The baseline runs east/west through northern Oregon from the Pacific Ocean to the Idaho state line, and was established so as not to pass through the Columbia River.