Increased Construction Activity in Southern End of I-25 South Gap Corridor, near Monument

Information courtesy of CDOT

Traffic jam on I-25

As part of the I-25 South Gap project, the Colorado Department of Transportation and contractor partner, Kraemer North America, began increased construction activity on the southern end of the project near Monument.

Since breaking ground in September 2018, the most active construction has been within a 5-mile stretch on the northern end of the project—between Castle Rock and Sky View Lane (Tomah Road)—where new, wider shoulders and Express Lanes are being built in the I-25 center median. But starting this week, crews are working on the southern end of the project between Greenland Road and Monument.

What Drivers Can Expect

Work on this 7-mile stretch at the southern end of the project will result in wider shoulders, new Express Lanes, new wildlife crossings, a new interchange at Greenland Road and the flattening of vertical curves approaching the Greenland Road exit. Work zones will vary along this portion of the corridor—some will be in the center median, while others will be on the outside. At some point, all traffic will be shifted to the northbound or southbound sides of I-25 sides to reconstruct the bridge at Greenland Road.

To prepare for building the work zones, crews are repairing damaged asphalt and restriping the pavement. As part of this work, drivers can expect overnight single lane closures from 8 p.m. to 5 a.m., Sundays through Thursdays. The lanes and shoulders will become narrower, and speeds will be reduced. Please pay attention to and drive appropriately for the changing roadway conditions.

Work on the northern section will continue. Watch for trucks entering and exiting the center median. Please maintain a safe following distance, obey all posted speed limits, allow trucks to merge, and do not follow trucks into the work zone.

By summer 2019, the entire 18-mile corridor will experience active construction. Remember, all construction schedules depend on weather.

About the I-25 South Gap project

CDOT is improving 18 miles of I-25 from south of Castle Rock to Monument by widening the road from two to three lanes in each direction. The new lane will operate as an Express Lane, allowing motorists the choice of taking the Express Lane for a faster and more reliable travel time in exchange for a toll, or driving the general-purpose lanes for free. Carpools with three or more people and motorcyclists will be able to ride the Express Lane for free.

Other improvements include widening the shoulders, rebuilding bridges, building new wildlife crossings, resurfacing with new pavement and modernizing technology. The cost of the project is $350 million. Substantial completion of the project is expected in late 2021 with Express Lanes opening in 2022.

Stay Informed

  • Project website for weekly updates:
  • Construction hotline: 720-745-5434
  • Email updates:
  • Text alerts: text I25GAP to 21000
  • Facebook updates:
  • Twitter updates: @coloradodot

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