

Above: the West End Bridge over the Ohio, with the Ohio Connecting Railroad Bridge behind it, and the McKees Rocks Bridge behind that. Below, the Allegheny, with the Fort Duquesne Bridge, the Three Sisters, the Fort Wayne railroad bridge, the Veterans Bridge, and the Sixteenth Street Bridge. For extra credit, see if you can point out the Twenty-Eighth Street Bridge. (Click on the picture to make it very big.)
This rehabilitated pair of bridges gets its name from the fact that the downstream span was used to transport hot metal across the river between the two sections of the giant J&L steel plant. The upstream span (which technically used to be the Monongahela Connecting Railroad Bridge) is now open to automobile traffic; the downstream span is reserved for bicycles.
Although official records spell this “Hot Metal Bridge,” it is always pronounced “Hotmetal Bridge,” with the accent on the first syllable.