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Transportation Expansion (T-REX)
Location Denver Metro Area
Project Sponsor Colorado Department of Transportation (CDOT)
Regional Transportation District (RTD)
Federal Highway Administration
Federal Transit Administration
Mode Highway / Light Rail

The T-REX project involved a major reconstruction of Denver's I-25/I-225 Southeast Corridor, as well as the expansion of the RTD light rail system. This corridor connects two major employment centers in the region-the Denver CBD and the Southeast Business District. The project is regarded as one of the most successful transportation projects in the U.S. and involved numerous innovations contributing to its completion ahead of schedule and under budget.

Major elements of the project included:

  • Widening major interstates to six to 10 lanes in each direction
  • Reconstructing eight interchanges, including I-25/I-225
  • Adding 19 miles of double-track light rail with west side alignment along I-25 and median alignment along I-225
  • Constructing 13 new light rail stations with 6,000 parking spaces
  • Adding 34 light rail vehicles to RTD fleet
  • Building a new light rail maintenance facility
Cost $1.67 billion
Funding Sources

Highway elements ($795 million)

  • GARVEEs (Colorado Transportation Revenue Anticipation Notes) - $600 million (backed by future Federal aid receipts)
  • Sales and use tax revenue - $195 million

Transit elements ($879 million)

  • FTA New Starts Full Funding Grant Agreement - $525 million
  • Sales and Use Tax Revenue bonds - $324 million
  • Local matching funds - $30 million (passenger fares)
Project Delivery/
Contract Method

Design-Build / Best Value

Private Partner None
Project Advisors/
Southeast Corridor Constructors (SECC)
Joint venture of Kiewit Construction Company and Parsons Transportation Group
Lenders Bondholders
Duration / Status 2001 to 2006
Financial Status Closed
  • Progressive financing incorporating voter-approved GARVEEs and sales tax revenue bonds
  • First design-build contract to incorporate major highway and transit elements into the same project
  • Use of design-build/best value contract selection rather than low bid to save an estimated 22 months of construction
Related Links / Articles Souteast Corridor Light Rail Line

Douglas Bennett
FHWA Colorado Division
Tel: (720) 963-3030

Terry Rosapep
Regional Administrator
Federal Transit Administration
Tel: (720) 963-3320

Randy Jensen
Regional Director
Colorado Department of Transportation
Tel: (303) 757-9459