Show/Hide

The City of Boulder welcomes your feedback. Use our Inquire Boulder customer service tool to tell us what’s on your mind.

  • Transportation Division
  • Transportation Projects and Programs
  • Maintenance
  • Maps of the Transportation System
  • Transportation Master Plan
  • Airport
  • Transportation Safety
  • Great Options Boulder
  • Boards

30th and Colorado Underpass

Project Update

The 30th and Colorado Underpass project is in the advanced preparation stage, with the team working diligently to complete the final design and funding package, obtain final property acquisitions and ensure the ground work is laid for a successful project groundbreaking. This work also includes utility relocation activities, which are currently taking place and are expected to continue through March 2020. For information on travel impacts, visit https://bouldercolorado.gov/transportation/transportation-projects-and-programs or https://maps.bouldercolorado.gov/cone-zones

We anticipate the project will be advertised for a construction bid in spring 2020, with construction beginning summer 2020. Construction is estimated to be about 18 months, finishing in early 2022. 

Project designs were shared with the public at Capital Improvement Program (CIP) Transportation Projects open house on March 6. If you were not able to attend, you can view the project boards that were presented below and provide your feedback using this online comment form

To stay up-to-date on the project, be sure to sign up for the project email list.   

Project Boards 

Board 1 thumbnail Board 2 thumbnail Board 3 thumbnail Board 4 thumbnail Board 5 thumbnail Rendering thumbnail

Project Background

The 30th & Colorado Bike and Pedestrian Underpass project will provide important safety, accessibility, mobility and drainage improvements to the intersection of 30th Street and Colorado Avenue. The project area is an important piece of the 30th & Colorado travel corridor for the Boulder community and the University of Colorado Boulder (CU). The existing intersection and at-grade crossings support high frequency transit service, provide important commuting connections for vehicle travel and connect the CU Boulder main and east campuses.

Today, the Average Daily Traffic through the project intersection ranges from 9,000 to almost 10,000 vehicles on Colorado Avenue and just over 21,000 vehicles on 30th Street. Each day, about 1,450 pedestrians and bicyclists (combined) pass through the 30th & Colorado intersection and more than 1,250 riders board and exit RTD and CU buses using the four stops at this intersection.

The Safe Streets Report (2016) found the 30th & Colorado intersection to be a top collision location within the city's street network, with 86 collisions occurring between 2012-2016, one involving a pedestrian and 18 involving a bicyclist. Additionally, the existing on-street bicycle facilities contribute to a high level of stress for some users, leading some bicyclists to ride on the sidewalks to navigate to and through this intersection. Bikes on sidewalks and in crosswalks moving against vehicle travel were indicated as a bicycle collision trend in the Safe Streets Report.

Looking to the future, the Boulder Valley Comprehensive Plan and the University of Colorado East Campus Master Plan forecast growth in the project area, which is expected to result in more people traveling through this intersection. The 30th & Colorado Underpass project will eliminate a barrier for university and community travel needs in this changing landscape.

Project Scope

The 30th & Colorado Underpass project will:

  • Provide a safer, more accessible and more efficient crossing of 30th & Colorado for those traveling through the intersection on a typical day: 
    • 30,000 vehicles
    • 1,450 pedestrians and bicyclists, and
    • 1,250 transit riders
  • Support the current and anticipated increased travel between CU's main and east campuses
  • Implement the 30th & Colorado Corridors Study final design options

Project Improvements

  • Construct a pedestrian and bicycle underpass of 30th Street (Concept B)
    • Construct a pedestrian and bicycle underpass of Colorado Avenue, if more funding becomes available (Concept C)
    • Construct an on-street crossing of Colorado Avenue east of 30th Street, if Concept C is not feasible
  • Construct a protected intersection
    • The intersection design may change if lessons learned from protected intersections constructed elsewhere in the city, state and nation demonstrate reason for concern
  • Implement the 30th & Colorado Corridors Study preferred alignments at the intersection
  • Connect to existing sidewalks, bike lanes and multi-use paths
  • Reconstruct or relocate existing transit stops
  • Evaluate traffic signal operations for potential changes
  • Install underpass lighting, landscaping and other urban design features
  • Incorporate public art
  • Review potential for a multi-use path connection to College Aven

Funding

The total project cost is estimated at $15.5 million, with $10.25 million to be secured through a combination of city and CU funds and $4.75 million in federal Transportation Impovements Program (TIP)  https://bouldercolorado.gov/transportation/transportation-improvement-program funds approved by the Denver Regional Council of Governments and administered by the Colorado Department of Transportation. 

Timeline

Project planning and design began in 2017. Construction is anticipated to begin in fall 2019, and take about 18 months to complete.

Public Involvement

Feedback received through the public process will be incorporated into the project design, where feasible. 

Previous Public Engagement

  • Intersection Improvements Open House, Oct. 29, 2018. 
  • 30th & Colorado Corridors Study Open House, Sept. 25, 2017. 
    • Review the information presented at this open house  here pdf
      • Read a summary of the comments received at the September 2017 open house here pdf
  • ​​30th & Colorado Corridors Study Open House, Feb. 7, 2018
    • Review the information presented at this open house  here pdf
    • Read a summary of the comments received at the September 2017 open house  here pdf
  • ​University of Colorado, Boulder Main and East Campus Outreach, r review the information presented at this event   here pdf Read a summary of the comments received   here pdf
    • Sustainability Summit, CU Boulder, April 25, 2018
    • University of Colorado Engineering Council finals week tabling event, CU Boulder East Campus, May 1, 2018
  • ​​30th & Colorado Corridors Study Open House, May 3, 2018
    • Review the information presented at this open house   here pdf
    • Read a summary of the comments received at the September 2017 open house  here pdf
  • ​National Federation of the Blind, Boulder Chapter, May 12, 2018
    • Review the information presented   here pdf
    • Read a summary of the comments from the National Federation of the Blind, Boulder chapter  here pdf
  • ​Community  Cycles Advocacy Committee, May 14, 2018
    • Review the information presented   here pdf
    • Read a summary of the comments received from the Advocacy Committee  here pdf
  • ​Center for People with Disabilities, May 21, 2018
    • Review the information presented   here pdf
    • Read a summary of the comments received from CPWD  here pdf
  • ​BeHeard Boulder, May 3, 2018 to June 1, 2018
    • Review the information presented   here pdf
    • Read a summary of the comments received through BeHeard Boulder  here pdf
  • ​Transportation Advisory Board, July 9, 2018 
    • Review the information presented   here pdf
  • University of Colorado Design Review Board, July 12, 2018
    • Review the information presented   here pdf
  • ​Intersection Improvements Open House, October 29, 2018
  • Intersection Improvements Open House, Oct. 29, 2018. 
  • 30th & Colorado Corridors Study Open House, Sept. 25, 2017. 
    • Review the information presented at this open house  here pdf
      • Read a summary of the comments received at the September 2017 open house here pdf
  • ​​30th & Colorado Corridors Study Open House, Feb. 7, 2018
    • Review the information presented at this open house  here pdf
    • Read a summary of the comments received at the September 2017 open house  here pdf
  • ​University of Colorado, Boulder Main and East Campus Outreach, r review the information presented at this event   here pdf Read a summary of the comments received   here pdf
    • Sustainability Summit, CU Boulder, April 25, 2018
    • University of Colorado Engineering Council finals week tabling event, CU Boulder East Campus, May 1, 2018
  • ​​30th & Colorado Corridors Study Open House, May 3, 2018
    • Review the information presented at this open house   here pdf
    • Read a summary of the comments received at the September 2017 open house  here pdf
  • ​National Federation of the Blind, Boulder Chapter, May 12, 2018
    • Review the information presented   here pdf
    • Read a summary of the comments from the National Federation of the Blind, Boulder chapter  here pdf
  • ​Community  Cycles Advocacy Committee, May 14, 2018
    • Review the information presented   here pdf
    • Read a summary of the comments received from the Advocacy Committee  here pdf
  • ​Center for People with Disabilities, May 21, 2018
    • Review the information presented   here pdf
    • Read a summary of the comments received from CPWD  here pdf
  • ​BeHeard Boulder, May 3, 2018 to June 1, 2018
    • Review the information presented   here pdf
    • Read a summary of the comments received through BeHeard Boulder  here pdf
  • ​Transportation Advisory Board, July 9, 2018 
    • Review the information presented   here pdf
  • University of Colorado Design Review Board, July 12, 2018
    • Review the information presented   here pdf
  • ​Intersection Improvements Open House, October 29, 2018

Contact 

Contact Jenny Godwin, Transportation Division, at [email protected] or by calling 303-441-4934.

Sign up for email updates

Email Address: