Information provided by the Colorado Department of Transportation
Construction is ramping up this summer on the I-25 South Gap project as crews take advantage of the warmer and drier weather to accomplish temperature-dependent operations such as asphalt paving.
This summer, crews will focus on paving, bridge construction, ramp improvements, wildlife crossings and building a truck climbing lane on southbound Monument Hill. Motorists can expect a variety of impacts along the 18-mile corridor in the coming weeks, including overnight closures of I-25 and extended lane or ramp closures.
Greenland Road traffic shift and ramp closures
What: A 12-hour single lane closure of southbound I-25 at Greenland Road directly followed by a 45-day closure of the southbound I-25 on-and off-ramps at Greenland Road. View a fact sheet.
When: 6 p.m. Thursday, June 25, to 6 a.m. Friday, June 26. Ramp closures in place 24 hours a day for 45 days.
Why: The initial lane and ramp closures will result in a major traffic shift the morning of June 26, which allows crews to construct the west half of the Greenland Road interchange. This will ultimately deliver a two-lane underpass at Greenland Road. The long-term ramp closures will allow crews to reconstruct the ramps into a new, permanent configuration.
Detours: Use County Line or Upper Lake Gulch roads – see detour maps
Full closures of southbound I-25 near Larkspur
What: A series of full closures of southbound I-25 near Larkspur, between Spruce Mountain Road and Upper Lake Gulch Road.
When: 7 p.m. to 5 a.m., Sunday, June 28, Tuesday, June 30, and Wednesday, July 1. Motorists can expect impacts as early as 6 p.m. each night, as crews begin setting up traffic control signs. The interstate will be fully open during the day.
Why: Safe reconstruction of the Spruce Mountain Road bridge, which spans I-25.
Detour: Southbound I-25 traffic will funnel into one lane just north of Spruce Mountain Road, where all traffic will exit. Motorists will then take Spruce Mountain Road south to the Upper Lake Gulch Road on-ramp to continue on southbound I-25. This detour is expected to take an average of five minutes.
Northbound I-25 traffic will funnel into one lane in this area. Expect slower speeds
Safety reminder: Traffic shifts along the corridor
Traffic shifts occur almost nightly along the 18-mile construction zone. Some of these shifts, specifically in the northern section of the project near Castle Rock, will result in less concrete barriers and wider lanes. Please remember the speed limit is 60 mph and fines are doubled in work zones. Increased enforcement is occurring on the ground and by aircraft. Exercise caution and pay extra attention as you travel the I-25 South Gap corridor.
All construction schedules are weather-dependent and subject to change. In all construction zones, please drive the posted speed limit, avoid distractions and increase your following distance.
About the Project
CDOT is improving 18 miles of I-25 between Monument and Castle Rock by widening the highway from two to three lanes in each direction. The new lanes will operate as an Express Lanes, allowing motorists the choice of taking the Express Lanes for a faster, more reliable travel time in exchange for a toll. Express Lanes will be free to vehicles with three or more people and motorcycles. All travelers will have the choice of taking the general-purpose lanes for free.
The project also includes shoulder widening, rebuilding bridges, new wildlife crossings, resurfacing with new pavement and modernizing technology. Project completion is scheduled for 2022.