Lewis River, Mountain river in Clark County, Washington, United States
The Lewis River is a waterway in southwestern Washington that originates in the Cascade Range and flows southwestward to join the Columbia River. Its course is interrupted by several dams and reservoirs that alter its natural flow and create recreational areas.
The river takes its name from Adolphus Lee Lewis, who established a homestead near its mouth in 1845 and later worked as the county surveyor. In the 20th century, hydroelectric development reshaped its natural flow and became central to regional growth.
The river sustained local Native American groups, particularly through salmon runs that provided food and shaped their settlement patterns throughout the region.
Several dams make the river accessible for different activities, from fishing to boating on the resulting reservoirs. Late summer and early fall offer the most comfortable visiting conditions with stable water levels and pleasant weather.
The river splits into multiple branches, with the North Fork dramatically altered by dams that created Swift Reservoir and Yale Lake for flood management. This transformation has given the waterway a substantially different character from its original form.
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