Lost Steel Plants of the Monongahela River Valley

Pittsburgh's Monongahela Riveris named after the Lenape Indianword Menaonkihela, meaning where banks cave and erode. The name is fitting: for over a century, these riverbanks were lined with steel plants and railroads that have now caved and erodedaway.

By the 1880s, Carnegie Steelwas the world's largest manufacturer of iron, steel ...