Cuyahoga [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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