Pittsburgh-Des Moines Steel Co.

[6][7] The company was founded in 1892 by two graduates of Iowa State College, William H. Jackson and Berkeley M.

[8] The partners initially contracted to have their steel tanks fabricated by Keystone Bridge Company of Pittsburgh, but soon took on a third partner, Edward W. Crellin, who was operating a small fabricating shop in Des Moines, Iowa.

It was at this point that the Des Moines Bridge and Iron Company was formed.

Moss left the company around 1905, after a new fabricating plant had been opened in Warren, Pennsylvania, in 1900.

[10] In July 1993, the original site and fabrication works in Des Moines, Iowa (by then called the Des Moines Heavy Bridge Division) was damaged beyond salvage due to flooding from the Raccoon River, causing the site to be permanently closed,[11] and later sold.