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Keystone Bridge Company
Founded 1865
Headquarters Pittsburgh, Pennsylvania
Key people Andrew Carnegie
Industry Civil Engineering
Products bridge building

The Keystone Bridge Company, founded in 1865 by Andrew Carnegie, was an important American bridge building company. It was one of the 28 companies absorbed into the American Bridge Company in 1900. The company advertised its services for building steel, iron, and wooden railway and road bridges. It held a patent for wrought iron bridges and also supplied wrought iron columns for buildings. Thomas Carnegie worked for Keystone Bridge as treasurer for roughly 20 years, from the founding of the company until his death in 1886.

Keystone is perhaps best remembered for the Eads Bridge in St. Louis, built in 1874, which survives to this day.

A panoramic image of Eads Bridge


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