The Marys River Watershed encompasses 310 square miles of forested, agricultural, and urban lands along the east side of the Coast Range in western Oregon. The watershed reaches to the highest point in the Coast Range, Marys Peak, at 4,200 feet elevation. Several headwater streams from the Coast Range merge into the Marys River, which flows into the Willamette River at the town of Corvallis at 250 feet elevation.
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