Modular Bridges

One of two modular bridges designed for a composite concrete deck at the 2000 Winter Olympics in Utah. Big R modular bridges are pre-engineered and pre-fabricated at our AISC certified facility for permanent installation. Our bridges serve a variety of applications: forestry, resort, oil and gas, county, to name a few. Available in spans from 16 ft to over 150 ft, our bridges come with a 4 ¼-inch deep steel deck and are available with square or skewed ends. Big R bridges are strong yet lightweight. Permanent structures can be covered with an asphalt road surface or for temporary installations we shop-install a timber running surface over the steel deck.

Our modular bridges allow for better fish passage than culvert and, due to ease of installation, streambeds and water quality are safeguarded during placement. Installation is easy and more cost effective than for large culverts.

Standard Features

  • Heavy duty loading
  • Galvanized steel deck
  • Weathering steel structurals
  • Bearing plates and pads
  • Curb or rail system
  • 14-foot width

Optional Features

  • Painted to customer specifications, including special paint for coastal or tropical areas
  • Timber or galvanized steel back walls
  • Running plank
  • Precast sills
  • Special bridge rail system
  • Any width (may require more than two sections)
  • Full-width running plank
  • Bolt-A-Bin® abutments
  • Atlantic Wire Wall abutments

Modular Steel Bridge Superstructures

  • Widths up to 28' available in as few as two modular panels
  • Wider superstructures using three or more modular panels also available
  • Can be placed on steel or concrete foundations
  • Can be fabricated with square or skewed ends
  • No waiting for concrete to cure
  • Easy installation in rugged terrain
  • Erection by local contractors or county forces using semi- or unskilled labor
  • Quick installation resulting in shorter road closures

Print Version
1.47 MB PDF

Single-lane Modular Bridge Specifications (Weathering)
28 KB .doc

Multi-lane Modular Bridge Specifications (Weathering)
32 KB .doc

Santa Fe National Forest steel bridge

Most of our structures are furnished in maintenance free weathering steel. Painted bridges are also available.

Big R Manufacturing portable bridge

This Big R Manufacturing portable bridge served as a construction detour while the permanent highway bridge was under construction.

painted portable bridge

Painted portable bridge used on an oil exploration road in Utah.

short-span portable bridges

Short-span portable bridges can be handled with a single excavator.