Design and Construction of the I -25 COSMIX Project in Colorado Springs

Colorado Springs has the most congested traffic in the nation among cities with populations under 500,000. I-25 through the city, designed for only 8,500, currently handles approximately 100,000 vehicles per day. Reflecting the rapid growth of Colorado and the regional importance of I-25 as a trade corridor, traffic volumes were projected to be 170,000 vehicles per day by 2020. COSMIX, short for the Colorado Springs Metro Interstate Expansion, was developed by the Colorado Department of Transportation to respond to this situation. This was the largest highway construction project in the history of Colorado Springs, and one of the larger design-build projects procured by the Colorado Department of Transportation (CDOT). The project widened I-25 from four to six lanes for 12 miles through an urban area, required the reconstruction of two major interchanges, and accommodated a future expansion to eight lanes. The project limits are shown in Figure 1. CDOT’s project goals included: (1) Maximize capacity and mobility improvements in the corridor within the program budget of $150 Million: there was a fixed budget available for construction; (2) Minimized inconvenience to the public during construction; (3) Complete construction by the end of calendar year 2008; (4) Provide a visually pleasing finished product. Development of the project Environmental Assessment (EA) began in 1999 and a finding of no significant impact was issued in 2004. CDOT advertised this project using a design build procurement contract. While a typical design build procurement asks the proposers to bid on a defined scope, and give a final price, this project had a different approach. CDOT had a fix amount of funding and asked the design build team to state what they could build for that given price. The project had elements that were required of all bidders, and then a list of additional elements that were optional. The Request for Proposals (RFP) contained a menu of seven Additional Requested Elements (AREs), and required the bidders to state which AREs were included in their proposal.

• Supplemental Notes:
  • The title of this paper is listed in the Table of Contents on the CD ROM as Design and Construction of the Cosmix Design Build Project in Colorado Springs.
• Corporate Authors:

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590

  National Concrete Bridge Council

  Portland Cement Association, 5420 Old Orchard Road
  Skokie, IL  United States  60077-1083

  Missouri Department of Transportation

  105 West Capitol Avenue
  Jefferson City, MO  United States  65102

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Abraham, Ryan
  • Reese, Gregg
• Conference:
  • 2008 Concrete Bridge Conference
  • Location: St. Louis MO, United States
  • Date: 2008-5-4 to 2008-5-7
• Publication Date: 2008

Language

• English

Media Info

• Media Type: CD-ROM
• Features: Figures; Photos;
• Pagination: 21p
• Monograph Title: HPC: Safe, Affordable, and Efficient

Subject/Index Terms

• TRT Terms: Bridge construction; Bridge design; Construction projects; Design build; Highway corridors; Project management; Traffic congestion; Traffic volume
• Geographic Terms: Colorado Springs (Colorado)
• Subject Areas: Administration and Management; Bridges and other structures; Construction; Design; Highways; I24: Design of Bridges and Retaining Walls; I53: Construction of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01105235
• Record Type: Publication
• Files: TRIS, USDOT, STATEDOT
• Created Date: Jul 28 2008 2:08PM