Structural Steel
Commercial buildings, industrial facilities, institutional work, and complex structural framing.
Explore capability
Steel fabrication since 1945
Built in Steel.
Proven in Partnership.
J.A. McMahon is an AISC-certified structural and miscellaneous steel fabricator serving commercial, industrial, institutional, and infrastructure projects.
1945Founded
AISCCertified Fabricator
32,000Square Feet Under Roof
4,500Tons Annual Capacity
Capabilities
Fabrication built around the project.
From standard structural framing to complex bridge components and one-of-a-kind weldments, our team combines fabrication expertise with proactive coordination.
Bridges & Components
Simple bridge fabrication, highway metal components, pedestrian bridges, and specialized railing systems.
Explore capabilityMiscellaneous Steel
Stairs, rails, ladders, platforms, architectural columns, and specialty metals.
Explore capabilityDesign Assist & Alterations
Constructability input, value engineering, field modifications, heat straightening, and custom solutions.
Explore capabilityFeatured Work
Steel that becomes part of the landmark.
A selection of bridge, education, commercial, and architectural projects completed by J.A. McMahon.
Certified Quality
Quality is controlled at every stage.
Our documented quality program supports consistent fabrication from contract review through delivery.
- AISC Standard for Steel Building Structures
- AISC Certified Bridge Fabrication — Simple
- AISC Standard for Bridge and Highway Metal Components
- AISC / AWS Certified Welding Fabricator
Facility & Equipment
Modern equipment. Experienced hands.
A 32,000-square-foot facility and automated processing equipment support precision, consistency, and production capacity.
Voortman V808Robotic 3D thermal cutting
Voortman V630Three-head CNC drilling
GPF 1024Plate processing and drilling
Cambco 825412-ton cambering machine
Start a Conversation
Have a project that needs a reliable steel partner?
Send us the project details, bid date, and available drawings. Our team will route the opportunity to the right contact.