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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 Lowland basin-fill aquifer. The Willamette Lowland basin-fill aquifer is 12,000 square mile aquifer underlying the region of Oregon and parts of Washington (state) between the Oregon Coast Range and the Cascade Range. The aquifer shares a name with the local river, the Willamette River, originating from a Clackamas Chinook word.