I-25 Trinidad Viaduct Design-Build

Trinidad, Colorado

Tsiouvaras Simmons Holderness teamed with Lawrence Construction Company to replace the I-25 viaduct through Trinidad, Colorado. Using CDOT’s Alternate Bridge Design and Construction special provision, TSH designed 13 bridges that included both conventional precast prestressed U-girders and more complex spliced post-tensioned curved U-girders. One of the bridges was a 260-foot post-tensioned span over the BNSF and AMTRAK railway, requiring coordination with both railroads. Due to this alternative approach, the Lawrence/TSH team was able to bid the project $9.2 million below the next lowest bidder, thus allowing the project to proceed. In addition to bridge design, TSH provided a complete freeway realignment, drainage design, roadway design, utility coordination, coordination with key stakeholders, and construction administration services.

  • Designed First-of-a-kind curved, variable-depth, spliced precast concrete tub girders
  • Won the PCI Harry H. Edwards Industry Advancement Award and PCI Best Bridge with Main Span Greater than 150 feet, 2012