Construction Begins in Phases, Starting on North End

The 18-mile I-25 South Gap project is split into three geographic sections – north, middle and south.

North Section: Castle Rock to Tomah Road
Since construction began in September 2018, roadwork focused on the northern section of the project, between Plum Creek Parkway and Sky View Lane/Tomah Road. Traffic was shifted to the outside to build the new Express Lanes in the center median. Next, crews will shift traffic to the center median so construction can occur on the outside. Overnight single lane closures will continue in this area. Watch for trucks entering and exiting the work zone.

South Section: Greenland Road south to Monument
In early 2019, construction will begin in the southern section of the project between Greenland Road and Monument. This section is more complex. Overnight lane closures and extended closures of the Greenland Road and County Line Road ramps and Monument Hill Road will be required for safety-critical work. Please be prepared for frequent changes in traffic patterns and reduced shoulder and lane widths. The speed limit will be reduced in this area as well.

Middle Section: Greenland Road to Sky View Lane
This section is the most complex. Work here is expected to begin in summer 2019.

Remember: All construction schedules in Colorado can be impacted by weather.

North Section Traffic Shifts

During construction on the northern end of the project—between Plum Creek Parkway and Sky View Lane—crews will shift traffic three times:

  • Traffic Shift No. 1
    • Crews have already shifted traffic to the outside shoulders to work on the I-25 median, where the new Express Lanes and wider shoulders will be built.
  • Traffic Shift No. 2
    • Then, traffic will move to the newly constructed area, so crews can work on the outside lanes. 
  • Traffic Shift No. 3
    • Finally, traffic will move back to the outside, so crews can place the final overlay and striping.