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Lewis River
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Lewis River (washington)




It rises in the Cascades in northeastern Skamania County , east of Mount Adams approximately 75 mi (120 km) northeast of Portland, Oregon . It flows generally southwest through the Gifford Pinchot National Forest , across central Skamania county, passing south of Mount St. Helens . It forms the boundary between Cowlitz (N) and Clark (S) counties, passing Cougar , Ariel , and Woodland . In its lower 10 mi (16 km), it turns sharply south and enters the Columbia from the east opposite St. Helens, Oregon , approximately 15 mi (24 km) NNW of Vancouver, Washington .

It is impounded for Hydroelectricity in its middle course to form Swift Reservoir , Yale Lake , and Lake Merwin , forming a chain of Reservoirs .


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