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Big R Bridge® Rolled Girders

With over 45 years of experience, Big R Bridge® rolled girder superstructures can be rapidly installed and are a cost-effective and proven solution for your vehicular and pedestrian crossing project. Each structure is designed and fabricated to precise tolerances and to meet your required specifications.

Truss Bridges for Conveyor and Pipe Support

Truss bridges can function as pipe or conveyor support systems or for a variety of material handling needs.

Vehicular Truss Bridges for Overpasses and Underpasses

As the design pacesetter for the industry, our vehicular truss structures are safe, durable, affordable and aesthetic solutions.

Vehicular Bridges for Heavy Loading Applications

The strength and durability of our Steadfast vehicular truss structures allow a wide range of unique solutions that accommodate heavy loading requirements, including HS20-44 and HS25.

Truss Bridges for Stream and Wetland Crossings

Longer clear spans minimize the use of piers or immediate supports. Therefore our pedestrian and
vehicular bridges are an ideal solution for crossing sensitive areas and wetlands with little or no impact on the environment. Lack of piers also leads to improved hydraulic efficiency.

Technical information for this product is centrally located in the technical guides section.

View Technical Information

Strong, lightweight modular bridges to accelerate your project

Strong, yet lightweight, Big R Bridge® steel rolled girders ship and install quickly on any foundation type and without the need for poured concrete or specialized bridge construction companies. Modular Bridges can often be installed in just a few hours, using local crews and on-hand equipment – saving you time and money in the process. 

Features and Benefits

  • Designed for AASHTO HL-93 or user specified permit loads
  • Permanent or temporary applications
  • Typical spans up to 120', or 150' with composite concrete deck
  • Single or multiple lanes
  • 8' wide modules are typical for Modular design
  • Modular or component designs
  • Standard highway loads and greater
  • Easy installation, even in rugged terrain
  • Shorter bridges can be installed with excavators or wheel loader
  • Use local contractors or your own crew
  • Shorter road closure times
  • No waiting for concrete to cure
  • Bearing plates and pads
  • Wide variety of guide rail  or curb systems available 
  • Excellent fish passage solutions


  • Wearing surface: cast-in-place or precast concrete, asphalt, steel grating, wood or gravel
  • Finish: Weathering, Painted, Galvanized, Zinc or Metalized Steel Explore finish options
  • Sidewalks and utility support capability
  • Steel back wall systems
  • Skewed ends to suit site
  • Faux trusses or arches for aesthetic treatments

Steel Rolled Girder Bridge Sections

Modular sections are usually about 8' wide for shipping on standard trailers. Lengths can reach up to 80'. Lengths greater than 80' will have  field-bolted girder splices. Custom lengths and widths are easily accommodated.

Ideal for permanent or temporary applications

Big R steel rolled girder bridges are favored by municipalities, counties, transportation authorities and resource companies for stream crossings, road or rail overpasses, detour bridges and more. 

The Contech Advantage

Agency/Regulatory Guidance

Our team is ready to provide you with expert advice and assistance on local regulatory requirements, resulting in faster approvals.

Solution Development

Our engineers can review your requirements, weigh all options, and recommend the optimal solution to integrate with your site designs.

Technical Expertise

Our engineers assist by providing product specific engineering calculations such as hydraulics, buoyancy, foundation reactions, and unit sizing.

Cost Estimates

We can quickly provide engineer’s cost
estimates to assist with your solution
selection process.

Site Specific Drawings

Our engineers can provide site-specific drawings for proposals, project meetings, and submittals, helping you be more efficient with your time.

On-site Assistance

Contractors know time is money, so we provide preconstruction meetings, delivery coordination, and on-site installation support to ensure a timely, smooth installation.