The company was formed in 1919 by Thomas R. Mullen, William H. Mohr and Les Kift during the height of Allentown's industrial era.

[2] In 1967, the company expanded, purchasing Kaufman Fabricators of Texas and Wolko Engineering of Pottstown, Pennsylvania.

[2] In June 1973, Lehigh Steel began to have labor problems when a wildcat strike over incentive pay for welders temporarily halted production.

[2] In June 1992, the Lancaster South Carolina plant was sold, and the last assets of Lehigh Steel were purchased by Thomas & Betts, an electrical equipment manufacturer based in Bridgewater Township, New Jersey on August 25, 1992.

Twelve Class A buildings will introduce more than 1,250,000 square feet of office, residential, retail and restaurant space along the western banks of the Lehigh River.

The Waterfront is expected to introduce 2,800 new jobs, 750 new residents, and generate more than $4,200,000 annually in additional real estate taxes.