4th Street Bridge (SH 96A) over the Arkansas River. Pueblo, Colorado

Award

  • 2011 ASBI Bridge Awards of Excellence for Innovation of Design and Construction and Minimization of Construction Impact on the Traveling Public
  • 2009 Roads & Bridges Magazine, “Top Ten Bridges Award”

Jury Comments

“The difficult challenge of completing the project over 28 active sets of rail tracks while minimizing disruptions to the traveling public and local businesses was solved using segmental construction. The project included a Colorado record span and was completed ahead of schedule for $165/sq.ft.!”

Services Provided by FINLEY

  • Bridge Design and Construction Engineering
  • Integrated Shop Drawings Preparation; Construction Analysis Manual and Camber
  • Falsework Design
  • Design Office Support during Construction
  • Geometry Control Manual Preparation
  • Falsework and Temporary Works Design
  • Stressing Data for the Post-Tensioning Tendons

Innovations

Difficult challenge of completing the project over 28 active sets of rail tracks while minimizing disruptions to the traveling public and local businesses was solved using segmental construction

Owner

Colorado Department of Transportation

Client

Flatiron Constructors, Inc., Longmont, Colorado

Photos

Courtesy of Flatiron

Cost

$27M

Start Date

December 2007

Completion Date

June 2010

Specifications & Details

2011 ASBI Bridge Award Winner (612 KB)

Innovation of Design and/or Construction Minimization of Construction Impact on the Traveling Public

Roads & Bridges 2009 Top 10 Bridges Awards (208 KB)

ASBI, SEGMENTS Newsletter, Volume 54, Fall 2009 (1 MB)

Project News
Fourth Street Bridge, Pueblo, Colorado

Reference Letter, Mike McNish, Project Manager, Flatiron (24 KB)

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The existing seven-span 4th Street Bridge opened in 1958 and carried two lanes of traffic in both directions, linking the historic downtown with the western residential neighborhoods of Pueblo. Options to replace and repair the existing bridge were evaluated prior to design, but the condition of the aging substructure drove the decision to replace the existing bridge. This project replaces the existing bridge which carries SH 96A over a city street, the Arkansas River, a floodwall, the Union Pacific Railroad’s river trail and railroad yards, and the Burlington Northern Santa Fe Railroad. The new bridge passes over 30 railroad tracks, including one mainline track for the BNSF Railroad and two mainline tracks for the Union Pacific Railroad.

The new bridges are twin cast-in-place segmental concrete box girder bridge with a six foot separation between the bridges. The new bridge span lengths are 151’, 235’, 377’, 229’ and 145’. The average length of the bridges is 1,137 feet. The superstructure cross section for each bridge provides for two twelve foot travel lanes, a six foot inside shoulder, a ten foot outside shoulder, and a ten foot sidewalk. The superstructure was built utilizing the balanced cantilever method of construction for interior piers 3 and 4 as well as cast-in-place construction on falsework for the end spans over piers 2 and 5. The box girder varies in depth from 8’ to 18’.