Traffic Impacts

For the week of Dec. 5

General Overview

West Frontage Road Impacts Coming Soon: Residents who live off the West Frontage Road near Castle Rock should plan for increased work in the area the week of Dec. 12. Crews will install a deer guard (which is like cattle guard) and rumble strips on the West Frontage Road.  Stay tuned to our weekly emails and our project Facebook page for more information about the impacts to come. Thank you for your patience! 

Remember: All construction schedules described below are weather-dependent and could change.

Intermittent Lane Closures and Pacing Operations

Nightly Sunday, Dec. 5 and Monday, Dec. 6, from 10 p.m. to 5 a.m., crews will have lane closures and traffic pacing along I-25 in both directions for overhead sign installation. Crews will close one lane and then slow traffic intermittently in the open lane to allow time for crews to hang the sign structures (think NASCAR pacing). Motorists can expect delays up to 20 minutes.

Watch for Traffic Impacts for Deer Guard Installation 

Watch for crews as they install deer guard (much like cattle guard) along roadways parallel to Interstate 25. Please pay extra attention while driving the areas listed below. All work is weather-dependent and subject to change.

Estimated Start Date Duration Location Traffic Control
Began Monday, Nov. 29 2 to 4 weeks Castle Rock Quarry off East Frontage Road One-way traffic will be maintained. 
Beginning Monday, Dec. 13 1.5 weeks West Frontage Road between Sky View Lane and Tomah Road  West Frontage Road closed between Sky View Lane interchange and Tomah Road. For access north of Tomah Road, use Plum Creek Parkway (exit 181). 

These deer guards are part of the I-25 South Gap project's wildlife safety mitigation efforts, which are expected to reduce animal-vehicle crashes by 90%. Thank you for your patience. Please email [email protected] if you have any questions! 


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

Closures Banner

Description Time Frame Work Detour

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

Sunday & Friday
Dec. 5 & Dec. 10
8 p.m. to 5 a.m.

Monday - Thursday
Dec. 6 - Dec. 9
7 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!

Two-week closure of the Spruce Mountain Road interchange

Began at approximately 8 p.m. on Wednesday, Dec. 1, and lasting two weeks

Final paving and striping operations

Use the Upper Lake Gulch Road interchange for access to I-25 and Larkspur.

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

Monday - Friday
Dec. 6 - Dec. 10
7 a.m. to 5 p.m.

Earthwork and erosion control

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

Frontage Road Banner

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)

Monday - Friday
Dec. 6 - Dec. 10
7 a.m. to 5 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 County Line Road, Greenland Road and Upper Lake Gulch Road interchanges to I-25.

Monday - Saturday
Dec. 6 - Dec. 11
7 a.m. to 5 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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