What is CDOT doing to improve I-225 southbound?

CDOT will be converting the shoulder to a lane on I-225 southbound from Yosemite St. to I-25, less than a mile.  This will be done by restriping to reduce congestion and improve traffic flow in the area.

What about the access restriction?

For the project to work, there will be an access restriction for some traffic.  Traffic coming from DTC Blvd., E.Quincy Ave. and Yosemite St. that takes I-25 from I-225 southbound will not be able to get on I-25 southbound.  This traffic will be directed to I-25 northbound.   Other ways to get on I-25 southbound are Hampden to the north and Belleview and Orchard to the south.   

Why will there be an access restriction?

This access restriction is necessary to prevent on-ramp raffic coming from DTC Blvd., E Quincy Ave. and Yosemite St. from weaving across I-225 southbound to take I-25 southbound. The length of merge is too short and would create safety problems and impede with mainline traffic flow on I-225 southbound.

There will be concrete barrier installed parallel to the right shoulder area of I-225 southbound where it merges with I-25.  This shoulder will operate as a lane taking on-ramp traffic  from DTC Blvd., E Quincy Ave. and Yosemite St. to I-25 northbound. 

Will there be other restrictions or barriers as part of this project?


When will construction begin and how long will it take?

Late October/early November.  Construction will occur on I-225 southbound from Yosemite St. to I-25 during the nights only with at least one lane open to traffic and will take two to four weeks.  Crews will set up the barrier as explained above in the first few nights and re-stripe the remaining nights. 

Why is CDOT re-striping I-225 southbound?

The section of I-225 southbound that narrows in the DTC region is one of the worst bottlenecks in the Denver region with three-mile back-ups during rush-hours.  Converting the shoulder to a lane is expected to reduce delays by more than 50 percent. The project can be done in a quick and cost efficient manner.   The cost is less than $1 million.

 How will this project impact local streets in Greenwood Village and the DTC?

We expect an increase in delays at Hampden and Belleview where traffic can access I-25. While there will be an increase in traffic at these interchanges, there will also be a decrease in traffic that currently uses local roads to bypass congestion on I-225 southbound.  Once delays are reduced on I-225 southbound as a result of the additional lane, we expect much of the cut-through traffic to return to I-225 southbound.    

CDOT has been working with local agencies to monitor these interchanges and will continue to do so during the life of the project to find solutions if significant increases in delays occur. 

What was the extent of your involvement with localities?

We have been working on the design for over a year, involving collaboration with localities and two independent studies to verify that the project will reduce congestion on I-225 southbound.  It is a pilot, meaning we will monitor and evaluate in coordination with localities to make adjustments when needed.

What do you mean by this is a pilot project?

CDOT will monitor the impacts on local roads and will continue to work with government on how to mitigate those impacts.  Should the project not work as expected with significant impacts, we will revert the road to what it is today when we have the funding to repave the road next summer.  We are confident based on studies, experience with similar projects and collaboration with local and federal transportation partners, the pilot will bring improvements.

Why can't you spend the money necessary to widen I-225 southbound?

There are numerous competing priorities for limited funding.  The $65 million it would take to widen I-225 southbound and rebuild bridges is not available for this project.  The less than $1 million re-striping project is a reasonable solution we can provide in the interim to provide much needed congestion relief until funding becomes available to do more permanent improvements.  

Contact Us
  • Project Hotline
  • Tamara Rollison
    [email protected]
    Denver Region and Strategic Communications Program Leader


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