Traffic Impacts

For the week of May 24


REMINDER: Increased enforcement is occurring daily on the ground and by aircraft along the I-25 South Gap corridor between Monument and Castle Rock. While traffic volumes remain lower due to Colorado’s Safer at Home plan, speeding tickets are occurring at the same level as this time last year. During a nine-day enforcement period in late-April 2020, the Colorado State Patrol issued 250 speeding tickets. Fines double in a construction zone.

For the safety of our crews and all motorists on the roadway, we need your help. Even as we experience an unusual level of free-flowing traffic in the South Gap area, we still need your commitment to adhering to the following safe driving behaviors:

  • Motorists are encouraged to limit travel to help prevent the spread of COVID-19
  • Never, ever drive impaired
  • Heed the signs, drive the speed limit and for the conditions of the work zone. Speeds will vary along I-25 through the Gap. The speed limit on the frontage roads is 45 mph, dropping to 40 mph during flagging operations.
  • Leave plenty of room between your vehicle and the one ahead—you are more likely to get into a crash if you follow too closely.
  • 66% of crashes on the Gap are caused by rear-end collisions resulting in nearly 80 % of injury-related crashes.
  • Be extra cautious and vigilant when driving for essential travel through the work zone. 
  • By the nature of the work zone, lanes and shoulders will be narrower and more difficult to drive through. Motorists should also anticipate changing roadway conditions, with frequent traffic shifts required for construction.
  • If possible, avoid driving on the Gap in bad weather. During past storms, motorists heeded CDOT's warnings and limited travel, which helped greatly to reduce crashes and prevent closures.
  • If there are no injuries or impairment suspected, please move your crash off the interstate to the nearest exit away from traffic.
  • Always slow down for emergency first responders
  • Take advantage of information sources to get the latest information. Text I25Gap to 21000 for alerts.

Read below to learn about anticipated traffic impacts on the project. Note, crews may require emergency mobile lane closures during daytime hours to refresh striping and fix potholes along the corridor. Check for current travel times.

Remember: all construction schedules are weather-dependent and could change.

Memorial Day Weekend Hours

This weekend, we formally remember those who gave their lives in service to our country. Construction crews are not planning any closures along I-25 beginning at noon on Friday, May 22. Planned traffic impacts and flagging operations will resume on Tuesday, May 26, beginning as early as 5 a.m.

If you must complete any essential travel, please drive safely, follow posted speed limits, keep a safe following distance, allow yourself plenty of time to get to your destination and never drive distracted. The project’s courtesy patrol will still be working over the holiday weekend (with the exception of Sunday) to help stranded motorists and keep traffic flowing.

12-Hour Left Lane Closure Wednesday

Crews will require a one-mile left lane closure on northbound I-25 between County Line and Greenland Roads, north of Monument, on Wednesday, May 27, from 3 a.m. to 3 p.m., for bridge work. This closure is necessary for crews to safely pour a bridge deck and allow the concrete to set for quality assurance purposes.

Full Closure of Greenland Road Underpass - Postponed due to heavy rain on Memorial Day Weekend

Crews are planning a full closure of the Greenland Road underpass this week. From 7 a.m. Wednesday, May 27, through 7 p.m. Thursday, May 28, motorists can expect this closure so crews can pave the Greenland Road underpass. The goal of this paving operation is a more permanent fix for the potholes that have developed in the area.

To access northbound I-25, motorists will detour south on I-25 to County Line Road and turn around to access northbound I-25. To access southbound I-25, motorists will detour north on I-25 to Upper Lake Gulch Road and turn around to access southbound I-25. The detour map for this closure is included below.

Greenland Underpass Closure


* Remember: planned lane closures can be affected by weather. 


Description Time Frame Work Detour

Overnight single lane closures northbound and southbound I-25
between Plum Creek Parkway and Monument

May 26-29
8 p.m. to 5 a.m.

Guardrail and pothole repairs, guardrail removal, grading, traffic shifts, striping operations, pavement work, paving operations, fiber testing, emergency pull-out sign placement and barrier work.

One lane open in each direction of I-25.
Stay the course!

12-hour single lane closure NB I-25 between County Line and Greenland roads

May 27
3 a.m. to 3 p.m.

Bridge work

One lane open.
Stay the course and expect delays

Full closure of the southbound I-25 off-ramp to Upper Lake Gulch Road.

Ongoing for 9 months  
(Began Oct. 25)

Bridge demo and rebuild.


To access northbound I-25 from Larkspur, motorists should use the Upper Lake Gulch Road on-ramp to northbound I-25.

To access Larkspur from southbound I-25, motorists should use the southbound I-25 off-ramp to Spruce Mountain Road.

Full closure of the Spruce Mountain Road on-ramp to northbound I-25

Ongoing for 9 months
(Began in October 2019)

Bridge demolition and 

Access northbound I-25 from Upper Lake Gulch Road

Shoulder closures along northbound and southbound I-25 throughout the 18-mile project corridor.  

May 26-29
8:30 a.m. to 4 p.m.

Earthwork and erosion control

One lane open in each direction of I-25. 
Stay the course!


Description Time Frame Work Detour
Single lane closures and flagging operations
along East and West Frontage Roads 
Plum Creek Parkway and Sky View Lane (Tomah Road)

Daytime Hours

May 26-30
8:30 a.m. to 4 p.m.

Installation of fiber optic lines,
frontage road repairs and install
Watch for flaggers who will direct traffic.
Residential access will be maintained. 
Thank you for your patience!
Flaggers will be present at the Greenland Road access to I-25

May 26-30
8:30 a.m. to 4 p.m.

Bridge work Watch for flaggers who will direct traffic.
Residential access will be maintained. 

Project Offices in Castle Rock

A temporary construction office for CDOT and its contractor partner, Kraemer North America, is located near the intersection of Crystal Valley Parkway and the I-25 east Frontage Road. Please watch for vehicles entering and exiting the site throughout the duration of construction. Upon project completion, the area will be returned to its previous state; the asphalt will be removed and the area will be re-graded and seeded.

Safety for drivers and workers is our top priority during construction.

 Get project text alerts:
Text I25GAP to 21000.

 Get project emails:

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