I-25 Rockrimmon Bridge Maintenance & Preventative Work

Project Facts

  • Contractor(s): Ralph L. Wadsworth Construction Company, LLC.
  • Location: Between the Garden of the Gods Road exit and Woodmen Road on I-25 (The main area of work consists of the Rockrimmon-Nevada interchange complex, constructed in 2007.)
  • Timeline: Spring 2018 through December 2018

Crews on this safety-improvement project will perform maintenance work on 10 bare concrete bridges near the I-25-Rockrimmon Boulevard interchange—from Garden of the Gods Road to Woodmen Road. This work—part of the ongoing CDOT Asset Management/Bridge Preventative Maintenance Program—is intended to extend the lifespan of these structures to 75 years.

Other benefits include:

  • improving safety.
  • creating a smoother ride by addressing settlement.
  • extending the serviceable life of the pavement along I-25.

Crews also will address surface preventative maintenance by:

  • replacing concrete panels where needed to extend the serviceable life of the overall pavement along I-25.
  • replacing curbs and gutters at the Woodmen Road interchange to extend the life of adjacent pavement/sidewalks.
  • paving slope to prevent loss of bridge abutment backfill.
  • restriping to add a continuous east turn lane at the Woodmen Road northbound exit ramp to improve traffic flow and safety.

Safety improvements include:

  • upgrading guardrail to meet new 31-inch standards.
  • replacing centerline guardrail with concrete barrier for ¾ of a mile on I-25.
  • restriping I-25.
  • using new technology and innovation to provide longer-lasting materials.
  • patching cracked concrete with asphalt in the east northbound lane, south of the exit to Rockrimmon Boulevard.

Settlement at this site is complex, due to deep fill with variable qualities and characteristics. By paving the road and concrete bridge decks with asphalt, this work will provide a maintainable surface and improve the current ride qualitys.

A hot mix asphalt (HMA) pavement overlay is considered the best option from the standpoints of safety, economics, efficiency, traveler impacts and road-user costs.


The I-25-Rockrimmon interchange is heavily traveled, with approximately 120,000 vehicles per day. Beyond this daily wear and tear, the bare concrete decks in this area are more susceptible to deterioration.

To address these issues, crews will perform the following work to extend the road's and the concrete decks' lifespan.

  • Replace expansion joints;
  • Install waterproof membrane;
  • Install asphalt overlays to protect the bridge decks;
  • Replace concrete panels on I-25;
  • Replace curbs and gutters at the Woodmen Road interchange;
  • Pave median and place barrier on I-25 for future shoulder pavement and median barrier;
  • Pave broken slopes;
  • Improve drainage at bridge approaches and on I-25;
  • Upgrade guardrail to meet current standards;
  • Replace a 3/4-mile stretch of guardrail with a concrete barrier;
  • Restripe on I-25 to add a continuous east turn lane at the Woodmen Road northbound exit ramp;
  • Improve ride quality through various paving processes and landscape work;
  • Improve traffic control and signage; and
  • Patch cracked concrete with asphalt in the east, northbound lane of I-25, south of the exit to Rockrimmon Boulevard.

Which Bridges are Affected?

  • Northbound and southbound Mark Dabling Bridge
  • Northbound and southbound Rockrimmon Bridge
  • Northbound and southbound Monument Bridge
  • Northbound and southbound Nevada Bridge
  • Northbound Mark Dabling Off-Ramp Bridge and Southbound Mark Dabling On-Ramp Bridge

Schedule & Traffic Impacts

  • Work will begin in spring 2018 and be completed in December 2018.
  • Normal hours are Monday through Friday, though some weekend work may be required.
  • Three lanes will remain open in each direction during daytime throughout construction.
  • All work is weather dependent and subject to change.

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