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The Williamson River is a river in southwestern Oregon in the United States, approximately 75 mi (121 km) long. It drains an arid area of approximately 3,000 sq mi (7800 km²) east of the Cascade Range in the watershed of the Klamath River. Together with its principal tributary the Sprague River, it provides over half the inflow to Upper Klamath Lake, the largest freshwater lake in Oregon.