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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 Stone survey point. Survey marker for the Willamette Meridian at Willamette Stone State Park, Washington and Multnomah Counties. Oregon Parks and Recreation. Land surveys accomplished under the U.S. Government's Rectangular Survey System are the basis for the establishment of land titles and boundaries within Oregon.