Temporary Traffic Pattern Detours

Colorado Highway 21 (Powers Boulevard) and Research Parkway interchange reconstruction continues

Updated: 7/15/2022

Traffic has been shifted onto the newly constructed bridges over Research Parkway and Cottonwood Creek allowing crews to continue bridge and roadway construction. Motorists continue to use the new southbound on- and off-ramps to access Research Parkway on the west side of CO 21. Traffic directly across CO 21 on Research Parkway is still restricted, motorists are advised to continue to utilize the hook ramps north and south of the interchange to cross CO 21 on Research Parkway. See map below.
On the night of July 24, crews will shift northbound CO 21 traffic to the west onto the new bridges over Cottonwood Creek and Research Parkway.
Crews are currently constructing Research Parkway under the new CO 21 bridge as part of the Diverging Diamond Interchange. Crews will continue earthwork operations, median work, pave the new roadway and install new signal, light poles and overhead signage.
  • 9 a.m. until 3 p.m., Monday, July 18 through Friday, July 22:
  • Single lane closures and lane shifts on Research Parkway between CO 21 and Grand Cordera Parkway to perform median work.

Current traffic configuration:

Research Parkway is open across Powers Boulevard (CO21). Direct through-access will remain restricted on Research Parkway through the interchange for several months. Current traffic alignment:
  • Research Parkway will have no direct through access across Powers Boulevard.
  • Northbound and southbound Powers Boulevard (CO 21) will continue to have no impacts.
  • Access to Powers Boulevard from Research Parkway on the west side will be limited to southbound access only, northbound and through access will use the signalized U turn south of the interchange.
  • Access to Powers Boulevard from Research Parkway on the east side will be limited to northbound access only, southbound and through access will use the signalized U turn north of the interchange.

To view the video of girder installation, follow the link to our project webpage.
Speed reductions to 45 MPH on Powers Boulevard (CO 21) and to 35 MPH on Research Parkway will be in place. Motorists should expect delays.
All scheduled closures are weather permitting.