Cuyahoga kī˝əhō´gə [key], river, c.80 mi (130 km) long, flowing SW through Cuyahoga Falls, then N to Lake Erie, NE Ohio, forming part of Cleveland harbor. By the late 1960s, the Cuyahoga was one of the most polluted rivers in the United States and a major contributor to the deterioration of Lake Erie. Antipollution measures were implemented, and by the late 1970s the status of the Cuyahoga was much improved. Cuyahoga Valley National Park , originally established in 1974 as a recreation area, is in the river valley between Akron and Cleveland.
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