Big R Bridge® Rolled Girder Bridges

Big R Bridge® Rolled Girder Bridges

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

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Strong, lightweight rolled girder bridges to accelerate your project

Strong, yet lightweight, Big R Bridge® 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 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 Design Center

The Contech Design Center provides engineers unparalleled flexibility in the layout and configuration of a Contech Bridge System. Our latest release includes options previously unavailable in a free, web-based design tool:

  • A 2D/3D design environment with high resolution graphics including BIM model output.
  • The ability to import a PDF site plan and design a system to scale over the plan.
  • Provide instant access to customized, project-specific drawings.
  • Design multiple systems per project and save for future use.
  • Digitally collaborate using the new “Project Collaboration” feature. Share your project easily with anyone through the new project management page.

Contech Design Center

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

Technical Guides
Big R Rolled Girders for Custom Use

Big R Custom Rolled Girders have the versatility to meet your site needs specific to  custom railings, covered bridges and aesthetics to match your site design.

Big R Rolled Girders for Forestry

Big R Rolled Girder bridges have been widely used for over 50 years in the forestry market and continue to be the most cost-effective option for these remote crossings.

Big R Rolled Girders for Farm and Ranch

Big R Rolled Girders are economical and  easy to install  for short crossings to home or ranch.

Big R Rolled Girders for Counties and Municipalities

Big R Rolled Girder bridges are an economical solutions for high and low traffic county road crossings and can easily be installed in a day. These prefabricated bridges reduce long term roadway shutdown and detours for County and Municipal roads.

Big R Rolled Girders for Mining and Industrial Usage

Big R Rolled Girder design can handle heavier loads as seen in the mining and industrial markets.

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 can 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.