Air quality monitors utilized during I-70 viaduct demolition have been removed as demolition was completed at the end of September 2021, current air quality monitoring data for the Central 70 Project can be found here.


Check out viaduct demolition progress on the Project webcam!

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Viaduct Demolition 

For the past 57 years, this viaduct has stood as a connector for eastbound and westbound traffic along I-70; however, it cannot accommodate the nearly 200,000 motorists who travel this stretch of roadway today nor the projected growth in the years to come.

The demolition of the I-70 viaduct between Brighton and Colorado boulevards on the Central 70 Project will begin the same weekend as the Mile High Shift full weekend closure happening as soon as May 21 - and will continue for three-to-five months.

All six lanes of traffic on the existing I-70 viaduct will be moved into the new lowered section of the highway, just to the north of the viaduct.

Additional Information


The viaduct will be carefully and slowly removed using excavators and cranes with netting in place to protect outside structures.

Demolition will require road closures when occurring above north and south connecting streets; consecutive streets will not be closed at the same time to maintain traffic flow.

    Viaduct demolition will take place primarily during daytime hours that are defined by the Denver Department of Public Health and Environment (DDPHE) as follows:

      • Daytime hours weekday: 7 a.m. – 9 p.m.
      • Daytime hours weekend: 8 a.m. – 5 p.m.

    During nighttime hours, noise will be monitored and must adhere to specifications set out in a variance approved by DDPHE. Direct impacts to individual intersections, properties and businesses are scheduled to last no longer than two weeks.

    • The viaduct was tested for lead in multiple locations prior to demolition and no lead paint was found above the EPA regulations
    • Crews will use water trucks and misters to control dust during demolition
    • Large nets will be set on the south side of I-70 during demolition to protect properties from debris
    • DDPHE does not have vibration regulations in place; however, Kiewit will monitor vibration has a dedicated team member available to manage operations with vibratory impacts during demolition

    Viaduct demolition is necessary to build out the eastbound lanes of lowered I-70 and to construct 46th South Avenue.

    A viaduct is a specific type of bridge that consists of a series of arches, piers, or columns supporting a long, elevated railway or road.