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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.
The Willamette Meridian is one of 37 Principal Meridians in the United States, each of which is named, that define the rectangular survey system. The Willamette Stone is the Initial Point or Point of Beginning of the Willamette Meridian.