1931 - Sanford and Benjamin High purchase King Welding company in Lancaster, PA. Company name is changed to High Welding Company.
1933 - High Welding completes its first experimental bridge welding project, welding angle iron stiffeners for a bridge near Stewartstown in York County, PA.
1946 - Contract is received for the reflooring of the Belvidere bridge over the Delaware River - the Company’s first major project involving fabrication and erection of structural steel.
1954 - Plant One was constructed.
1958- Company purchases automated welding equipment. Interstate building boom begins. First welded girder bridge completed, I-83 at Shawan Road in Maryland (still in service today).
1967 - 1969 - Plant Two was constructed and expanded.
1970 - High Welding received 8,000-ton contract for the Columbia-Wrightsville Bridge carrying Route 30 over the Susquehanna River near York, PA.
1971 - Company name changed to High Steel Structures, Inc. First heat shrink curved girders fabricated for Maryland State Highway Authority.
1976 - High teams with contractor G.A. and F.C. Wagman on the 17,000-ton I-95 / I-395 Interchange spanning the Middle Branch of the Patapsco River in Baltimore, Maryland.
1979 - High Steel helps to pioneer testing criteria and controls for "fracture critical members" for Interstate 95 over the Harbor Tunnel in Baltimore, MD.
1983 - High Steel receives first OSHA Star designation, recognizing excellence in its occupational health and safety program.
1985 - Paint Bay added to Plant 2. High Steel acquires assets of Williamsport Fabricators, which becomes Plant 3.
2000 - High Steel expands Plant 3 in Williamsport, PA, doubling the facility's size. Lancaster fabrication facilities certified for OSHA Star VPP Status. High Steel awarded 10,800-ton contract for the Springfield Interchange, Phase 4 at I-95, I-495 and I-395 in Fairfax County, Virginia.
2001 - High Steel awarded 28,000 ton steel fabrication contract for Arthur Ravenel, Jr. Bridge over the Cooper River in Charleston, SC, the largest in the company's history.
2003 - Lancaster fabrication facilities recertified for OSHA Star VPP status. Lancaster Quality Management System registered to ISO 9001:2000. High Steel awarded 20,900 ton contract for the Woodrow Wilson Bridge project, Maryland approach spans.
2004 - Williamsport fabrication facilities cited as winners of the Pennsylvania Governor's Award for Excellence in Safety, also know as the PENNSAFE award. Williamsport Quality Management System registered to ISO 9001:2000.
2006 - High Steel awarded 16,524 ton contract for the I-95/I-695 Interchange, Phase 1, in Baltimore, MD.
2007 - Williamsport fabrication facilities certified for OSHA Star VPP status.
2008 - High Steel awarded 19,400-ton contract for I-495 HOT Lanes in Fairfax County, VA.