The Edge Moor Iron Company engaged in the manufacture of iron and steel bridges at a plant located on the Delaware River north of Wilmington. The company was incorporated in Delaware in 1869 by brothers-in-law Eli Garrett (1830-1886), John Sellers (1826-1906), and William Sellers (1824-1905), a noted Philadelphia mechanical engineer. Among its more important projects were the Brooklyn Bridge deck, the second Rockville Bridge over the Susquehanna River, and the Kentucky River Bridge of the Cincinnati Southern Railroad.

The company began enlarging its works and adding a rolling mill in 1882, but the financial upheavals of the 1880s and 1890s delayed completion until 1897. By this time, the firm was in financial difficulty, and in 1900 it sold its bridge works to the newly-organized American Bridge Company, which became a subsidiary of U.S. Steel in 1901. The Edge Moor rolling mill was dismantled, and the plant was closed in 1925. The Edge Moor Iron Company was placed in receivership and liquidated in 1936.

The boiler works continued in operation under a new owner, the Edge Moor Iron Works, Inc., incorporated on August 11, 1936.