The Union Bridge Company was a bridge fabricator and contractor with works in Buffalo, New York, (believed closed in 1890 per HAER references) and Athens, Pennsylvania. The Union Bridge company was formed in 1884 as a merger of several other bridge-building firms. Partners included George S. Field of Buffalo, Edmund B. Hayes of Buffalo, Charles MacDonald of New York City, Thomas C. Clarke of Seabright, NY and Charles Stewart Maurice of Athens, PA.[1]