Molten steel once crossed the Monongahela River on the Hot Metal Bridge in front of you, a railway bridge built in 1900 that carried ladles from the blast furnaces on the South Side to the rolling mills on the north bank. The name is entirely literal: this bridge carried hot metal. Ladles holding hundreds of tons of liquid steel at temperatures exceeding 2,600 degrees Fahrenheit crossed this span multiple times daily in a process that ran continuously for decades.
The bridge was converted to pedestrian and bicycle use in 1999, one of the signature projects of Pittsburgh's post-steel transformation. The Hot Metal Bridge is now part of the Three Rivers Heritage Trail system, connecting miles of riverside paths on both banks of the Allegheny and Monongahela. Barges still work the river but the steel is gone.
The South Side Works development just upstream is built on ground where blast furnaces once roared. The bridge has become a symbol of Pittsburgh's reinvention: a structure built entirely for industrial purposes, now carrying joggers and cyclists through a landscape that was once the most productive industrial valley in the world.