Phase III detours and constuction are in effect through October 31. Significant delays are anticipated for both inbound and outbound traffic.

The Castle Creek Bridge / Hallam Street Improvement project team wants to be as flexible as we can to reduce traffic impacts. We’re trying to get as much work done as possible with the smallest impact possible, so after testing field conditions we are able to adjust to periodic detours.

This means that whenever possible, crews will run two-way traffic over the bridge. Crews will only be running the full Power Plant detour when it is necessary.

We appreciate your patience as we make progress on this dynamic project. Please reach out with any questions or concerns

Additional Reminders:
  • The bridge will be closed to pedestrians and cyclists for the duration of phase III and a detour will be in effect. There will be heavy machinery and construction. The people on the construction site are trained to be there and so for your safety and the safety of crews – please use the detour via Marolt Open Space.
  • The intersection of Seventh Street and Main Street is anticipated to be closed for the duration of phase III. Access will remain open via Hallam Street.
  • Click below for latest maps, project information, alternative transit options and other resources.


Updated 4:50 PM on 9/20/18 | Schedule and routes are approximate and subject to change.

  • Thursday (9/20) – Power Plant Detour in effect for outbound traffic during construction hours (approximately 7 AM – 7 PM)
  • Friday (9/21) – Power Plant Detour in effect for outbound traffic during construction hours (approximately 7 AM – 7 PM)
  • Saturday (9/22) – Two-way traffic across the bridge
  • Sunday (9/23) – Two-way traffic across the bridge
  • For the next two weeks (9/24-10/5), anticipate the full Power Plant detour to be in effect for outbound traffic during construction hours
  • View Power Plant Detour Map >>
  • For the latest schedules, check back here or contact the project phone, 970-618-5379 (call or text).


The Castle Creek Bridge / Hallam Street Improvement Project seeks to improve safety and function for pedestrians, cyclists and motorists on the busiest street in Aspen, CO. Key project components include: a protected 8-foot-wide concrete trail, upgraded bus shelters, repaired roadway and improved intersections at both Seventh and Eighth Street. These improvements will increase user safety, promote multi-modal connectivity, upgrade our public transportation infrastructure and enhance corridor aesthetics.


In 2014, the City of Aspen identified the Castle Creek Bridge and Hallam Street corridor as a deficient link in Aspen’s bicycle and pedestrian network. Safe and efficient travel options for cyclists and pedestrians are limited through this area due to topographic, property, and geometric constraints. This is one of the top ten accident locations in the city. Most of the infrastructure between 7th Street and the west side of Castle Creek Bridge has received no significant upgrade since 1962 and many repairs are required. Through extensive public outreach, multiple connectivity studies and experiments, and conceptual planning the City of Aspen developed a project plan to address this critical connection.



The project team invites the community to participate in a monthly project update meeting occurring on the fourth Wednesday of every month. Each meeting will cover upcoming work schedules and traffic impacts.

The next meeting will be held on Wednesday, September 26 in the Sister Cities room at City Hall.
Update Meeting : 4 p.m. | Conference Call : 5 p.m.

Conference Call Information:
You can also dial in using your phone: +1 (646) 749-3122
Access Code: 315-961-749

Additional Meeting Date: 10/24

Those unable to attend the meetings are encouraged to sign up for project update email to receive the latest project information and to reach out to the project team at any time with questions or concerns.