CDOT North I-25 Segments 5 & 6 (Hwy 402 to Hwy 66) CM/GC

SEMA and Joint Venture Partner RL Waldsworth have partnered with CDOT on this important CM/GC project. This project will improve safety and capacity to support the growth in Northern Colorado, specifically the section of I-25 between Mead and Johnstown. This project is broken into two sections – Mead to Berthoud and Berthoud to Johnstown.

Total fiunding

Initial work will include various lane closures along I-25 as crews set barrier to prepare the work zone. When the project is complete in 2023, it will add an Express Lane in each direction of I-25, replace aging bridges, make interchanges safer and more efficient, and improve infrastructure for bus transit along the I-25 corridor.

The overall project will:

  • Increase highway capacity by adding an Express Lane in each direction from Colorado Highway 402 to Colorado Highway 66
  • Rebuild interchanges
  • Replace 20 aging bridges: two state highway crossings over I-25, two county roads over I-25, 10 interstate crossings over cross streets, two spanning the Little Thompson River and four crossing the Great Western Railroad
  • Add Express Bus service (Bustang) throughout the corridor
  • Incorporate the use of intelligent transportation systems
  • Add carpool and transit facilities
  • Make major utility improvements including replacement of 42-in. waterline
  • Straighten highway curves to improve safety
  • Add water quality facilities and improve drainage
  • Realign the channel of the Little Thompson River near I-25


This project brings economic, environmental and quality of life benefits for northern Coloradans and Interstate users by:

  • Making safety improvements to reduce the number of crashes and fatalities
  • Decreasing travel time and increasing trip reliability
  • Reducing emissions and improving freight efficiency
  • Employing congestion management and safety technology to improve the travel experience
  • Rebuilding aging and obsolete infrastructure
  • Improving transit, bicycle and pedestrian connectivity