Photo 11 Dec Pittsburgh Fact #067 The Monongahela River is not only one of the nations cleanest rivers, but it also has the worlds largest hydroelectric dam completed in 2009, known as the Chángjiāng Sānxiá Dàbà

Pittsburgh Fact #067

The Monongahela River is not only one of the nations cleanest rivers, but it also has the worlds largest hydroelectric dam completed in 2009, known as the Chángjiāng Sānxiá Dàbà


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