Skip navigation

Colfax Corridor Connections

Colfax Corridor Connections logo

Colfax Corridor Connections is a project that is studying mobility needs and identifying transit and other multimodal improvements, including bicycle, pedestrian and vehicular, within the East Colfax travel corridor. The corridor is roughly bounded by I-25 and I-225 to the west and east, respectively, and by 12th Avenue and 20th Avenue on the south and north.

The findings of recent City and County of Denver transportation planning efforts determined that additional capacity is needed in the East Colfax corridor now and in the future. As a result, this study, Colfax Corridor Connections, was initiated in June 2012 with the goal of improving transit and overall mobility within the corridor now and over the next 25 years. 

Throughout the project, the City and its partners will seek public input to help identify the solutions that will meet the transit and mobility needs of communities that live, work and travel in the corridor.

Project Details

Colfax Corridor Connections is a study of transit and mobility within the East Colfax corridor being conducted by the City and County of Denver and the Regional Transportation District (RTD) in partnership with the Federal Transit Administration (FTA) and in coordination with the City of Aurora. The goal of the project is to improve transit, overall mobility and livability within the corridor now and over the next 25 years.

The project corridor is roughly bounded by I-25 and I-225 on the west and east, respectively, and 20th Avenue and 12th Avenue on the north and south.

Among the options being analyzed are:
  • Operational (such as revising the operations of existing transit routes, new or modified transit routes, transit-only lanes and more)
  • New transit technologies (such as larger buses, bus rapid transit, modern streetcar, light rail or others)
  • Other improvements (such as bicycle/pedestrian connections and more)           

All major routes and alignments within the corridor, not just Colfax Avenue, will be included in the analysis. Project phasing options, environmental impacts/benefits and estimated costs of alternatives will be evaluated.

The findings of a recent 2010 Streetcar Feasibility Study and the 2008 Denver Strategic Transportation Plan both identified a need for significant additional mobility capacity in the East Colfax corridor by 2030. The feasibility study also noted the four existing east-west bus routes in the study area regularly operate at or beyond capacity, particularly during peak periods.  As a result, the City and its planning partners in the area have agreed that East Colfax transit needs should be analyzed.

The project began with an Alternatives Analysis (AA), followed by an environmental study that will comply with the National Environmental Policy Act (NEPA).  NEPA compliance is expected to require an Environmental Assessment (EA). 

Public input is essential to the success of this project. To ensure maximum public participation, the City is implementing a proactive, community-responsive public involvement program. 

Learn how to 
get involved with Colfax Corridor Connections.

Colfax Corridor Connections is evaluating a wide range of transit and multimodal alternatives to address mobility needs in the East Colfax corridor.  The alternatives analysis and related environmental study will be completed in the following four phases. There will be opportunities for public review and input in each phase of the  project schedule:

  • Phase 1: Public Scoping (Complete: Fall 2012) – Create the list of options for meeting mobility and transit needs in the corridor. 
  • Phase 2: Alternatives Analysis (Complete: Winter 2013) –  Conduct increasingly detailed evaluation of alternatives to eliminate flawed alternatives and identify those that best meet the needs of the corridor with the least environmental impact.
  • Phase 3: Conceptual Engineering/Environmental Analysis (In Progress) – Provide greater analysis on selected alternatives. 
  • Phase 4: Environmental Assessment (Dependent on Phase 3) – Present a final decision document reflecting results of the analysis.

As Colfax Corridor Connections progresses, this page will be updated to provide detailed information about the transit alternatives being evaluated by the project.

Colfax Corridor Connections began in June 2012 and is expected to be completed in four phases. The list below identifies the projected schedule.

  • Phase 1: Public Scoping (Complete: Fall 2012) – Create the list of options for meeting mobility and transit needs in the corridor. 
  • Phase 2: Alternatives Analysis (Complete: Winter 2013) –  Conduct increasingly detailed evaluation of alternatives to eliminate flawed alternatives and identify those that best meet the needs of the corridor with the least environmental impact.
  • Phase 3: Conceptual Engineering/Environmental Analysis (In Progress) – Provide greater analysis on selected alternatives. 
  • Phase 4: Environmental Assessment (Dependent on Phase 3) – Present a final decision document reflecting results of the analysis.

The City and County of Denver will conduct extensive community outreach throughout the project to ensure that the recommended alternative is reflective of what is best for the communities within the East Colfax corridor.

Colfax Corridor Connections is a natural progression of two related City and County of Denver (CCD) transportation planning studies. The findings of these efforts led to the determination that additional transit capacity is needed in the East Colfax corridor now and in the future. 

  • Colfax Streetcar Feasibility StudyA feasibility study was recently completed to determine whether any high-level fatal flaws exist that would preclude implementation of a streetcar system in the East Colfax corridor. No fatal flaws were identified and the study noted the four existing east-west bus routes in the study area are regularly operating at or beyond design capacity, and particularly during peak periods.  The study identified the need for an alternatives analysis to determine best ways to improve transit and overall mobility within the corridor.
  • Denver Strategic Transportation Plan This plan was completed in 2008 and identified a need for significant additional person-trip capacity in the East Colfax corridor by 2030. 

Other active projects in the area with websites you may be interested in:
  • Colfax Avenue Enhanced Corridor - Grant to Columbine (CBID) and Columbine to St. Paul (Greektown): Improvements will help create an enhanced transit corridor, such as lighting, sidewalk, curb ramps and trees. Construction began in March 2012. (City and County of Denver)
  • Pedestrian and Bicycle Safety in the Denver Region (report is in Draft stage as of April 2012): This study is metro wide ; however, issue areas identified include areas of Colfax Avenue which experience a high number of pedestrian and bicycle crashes per mile. (DRCOG)
  •  I-225 Light Rail Extension: Part of FasTracks, this project will add 10.5 miles of light rail between Nine Mile Station and Peoria/Smith Station. (RTD)
  • Downtown Denver Circulator: Part of FasTracks, this high-frequency bus service will connect passengers with shuttle service for the downtown area. (RTD)
  • Colfax 2012 VisioningA public input process to create a vision and identify goals and strategies for the development of the Colfax corridor from Yosemite Street to I-225. (City of Aurora)

The Colfax Corridor Connections Community Task Force is comprised of individuals representing neighborhood organizations and business interests within the corridor. The task force will meet up to six times during the study – once during each of the four public-meeting milestones with one or two additional meetings, if needed, to help provide additional input. 

This group provides an important connection between the project team and the community and its input will help inform the process. The Community Task Force is also an important resource for sharing project information with the constituents they represent. Each of the following organizations has been invited to participate in the Community Task Force program:

Denver Business Groups
• Colfax Business Improvement District 
• Colfax On The Hill
• Downtown Denver Partnership 
• East High School 
• The Fax Partnership
• Points Historical Redevelopment Corporation
• Santa Fe Drive Redevelopment Corporation

Denver Neighborhood/Community Groups
• Balustrade HOA
• Bellvue-Hale Neighborhood Association
• Capitol Hill United Neighborhoods
• City Park West Neighborhood Association
• Civic Center Association
• Congress Park Neighbors, Inc.
• Cultural Arts Residential Organization
• Curtis Park Neighbors
• Downtown Denver Residents
• East Montclair Neighborhood Association
• Golden Triangle Museum District
• Greater Park Hill Community, Inc.
• Historic Montclair Community Association
• La Alma/Lincoln Park Neighborhood Association
• La Alma Community Action Group
• Mayfair Neighbors, Inc. 
• Neighbors And Friends For Cheesman Park 
• South City Park Neighborhood Association
• South Park Hill Neighborhood Organization 
• Sumner Neighborhood Association 
• Swallow Hill Neighborhood Association
• Triangle Neighborhood Association 
• Unsinkables, Inc. 
• Uptown Alliance 
• Wyman Historic District Neighborhood Association 

Aurora Business Groups
• Aurora Chamber of Commerce
• Aurora Economic Development Council

Aurora Neighborhood/Community Groups
• Colfax Community Network
• Friendly Village Aurora N.O.
• Hillcrest Village HOA
• Neighborhood Action Team
• Northwest Aurora Neighborhood Association
• Norfolk Glen Neighborhood Association

Project Materials

Contact Us

Project Manager
Tykus R. Holloway, PE, AICP

Stay Updated:

Twitter icon Facebook icon

Submit a comment about the preliminary Bus Rapid Transit recommendation

Frequently Asked Questions

East of I-25, Colfax Avenue is one of the City’s highest traveled east-west transportation routes. During the peak hours, some intersections exceed capacity causing traffic congestion and travel delay.  Over the next 20 years, the study area is expected to experience a 25% growth in person-trips (number of travelers), 67% growth in employment (jobs), and 25% growth in population. As a result, the need to address mobility for all modes of transportation within the Colfax Avenue Corridor study area is critical to improving safety and meeting the long-term economic viability and mobility needs.

The study corridor (referred to as the “Colfax Avenue Corridor”) is defined roughly as Colfax Avenue from I-25 on the west to I-225 on the east and 20th Avenue on the north to 12th Avenue on the south.

The study includes an analysis of many different mobility options and potential alignments in the Colfax Avenue Corridor. A broad range of alternatives were considered and narrowed down to three specific alternatives that best fit the purpose and need for the study. The alternatives included Enhanced Bus, Bus Rapid Transit (BRT), and Modern Streetcar. In addition, a range of alignments were considered that included Colfax Avenue, 13 th Avenue/14 th Avenue, 17 th Avenue, and 20 th Avenue/Montview Boulevard. The preferred alignment that best fit the project purpose and need was narrowed down to Colfax Avenue.

Following a focused, year-long technical analysis of all three alternatives, BRT on Colfax Avenue was identified as teh preliminary Locally Preferred Alternative (LPA). The BRT system would convert Colfax Avenue's outside travel lane in both directions to exclusive transit lanes during the weekday morning and evening peak travel periods (i.e., rush hour) for as much of the corridor as is possible. The inside travel lanes would remain available for all vehicles to use. The rest of the day and on weekends, buses would continue to operate in the outside travel lane with traffic. While the goal is to have as much of the corridor available for exclusive transit-only lanes, it is likely that there will be some locations in the corridor where technical or operational constraints may not allow exclusive lane operation. Additional analysis will be done to determine these locations.

Bus Rapid Transit is an enhanced transit option that features upgraded vehicles, enhanced stations and operation in a dedicated transit lane wherever possible. Potential vehicle upgrades include recognizable/branded vehicles as well as low-floor and multi-door boarding features that make it easier and faster for all riders, especially those with special needs, to get on and off. Enhanced station amenities would feature real-time passenger information, off-bus ticketing, shelter and safety improvements. The proposed BRT system on Colfax would reliably operate buses every five minutes with the existing RTD Route 15 continuing to provide local bus service.

For the purposes of the Colfax Corridor Connections study, a dedicated transit only lane is defined as a travel lane that is dedicated for use by transit vehicles only during the weekdays in the morning and evening peak hours of travel (6-9am and 3-7pm, i.e., rush hour). Along Colfax Avenue, the existing outside travel lane would be used as the dedicated transit only lane during the peak hours in both directions.

During the dedicated, transit-only lane hours of operation, right-turns from the exclusive lanes and access to/from parking will still be permitted. This is similar to how the exclusive lanes work along Broadway/Lincoln in downtown Denver. On weekends and at all other times during the weekdays, approximately 18 hours daily, vehicular traffic on Colfax Avenue and the adjacent roadways would most likely not change due to the LPA.

Additional detailed analysis of potential roadway and other impacts along Colfax Avenue, and the adjacent roadways, will be performed this fall/winter during the environmental (NEPA) phase of the project. This will identify issues and/or potential mitigation measures associated with the preliminary LPA.

A number of other transportation improvements are included in all the alternatives under consideration as a part of this study. As the preliminary LPA undergoes a comprehensive environmental evaluation, a package of supplemental improvements will begin to be identified. These include existing bus service, roadway operations, bicycle/pedestrian facilities, signage/wayfinding, and more.

No. The preliminary LPA does not propose to remove the on-street parking, but rather utilize (to the greatest extent possible) the existing Colfax Avenue bus stop areas, which are anticipated to provide enough space for the proposed transit stop improvements. Upon completion and approval of the environmental compliance phase of the project and pending funding availability, a detailed design phase would be undertaken to finalize the stop area configurations.

The study is taking into consideration how the overall FasTracks system and its I-225 Rail Line will influence transportation and mobility within the Colfax Avenue Corridor area and how those systems, including I-225, will interact with the intent of creating a cohesive transportation system that meets mobility needs.

The estimated total cost for the study is $3 million, which includes $1 million in City and County of Denver funds and a $2 million grant from the Federal Transit Administration. The grant included two main components, which were to: 1) undertake a transit alternatives analysis and environmental compliance (NEPA) study, and 2) further develop the regional long-range transportation model (FOCUS model) in partnership with RTD and DRCOG.

Colfax Corridor Connections is identifying an action, or set of actions, to meet transit demand and improve overall mobility in the Colfax Avenue Corridor now and over the next 25 years.  Project benefits include, but are not limited to:

  • Increased person-trip capacity in the study area (e.g., enhancing transit will increase to total number of people that can travel along Colfax Avenue to/from their desired destinations)
  • Improved safety, livability, accessibility and mobility options for all travelers
  • Increased economic viability and investment by attracting new residential and commercial development
  • Improved transit travel time of up to 10 minutes during peak hours, saving time and money for travelers
  • Improved access to 280,000 jobs and nearly 50 schools along and near Colfax Avenue
  • Numerous bicycle, pedestrian and other transportation improvements

A high-level economic review was conducted through an analysis of case studies from peer cities, local/national developer and private-investor interviews, as well as an inventory of development potential for all parcels along Colfax Avenue within the study area. The economic analysis provided the following key findings:

  • Shallow lot depth along Colfax Avenue limits the scope and scale of new development opportunities
  • Investing in transit along Colfax Avenue will improve property values
  • Developers and key stakeholders indicated the quality of the transit investment (e.g., bus stop amenities, aesthetics, level of transit priority, and other improvements) was important to their future (re)development and investment considerations along Colfax Avenue.

Colfax Corridor Connections is a study to identify the specific transit and mobility option that best meets the overall transit demand and improves mobility in the Colfax Avenue Corridor. The option, or set of options, will become part of a long-range transportation plan and be implemented, pending funding availability and FTA approval.

Public input is essential to the success of this study. To ensure maximum public-participation, the City and County of Denver and its partners have and will continue to implement a proactive public-involvement program that is designed to be responsive to feedback from the community. Public input is vital to making decisions that are in the best overall interest of the communities within the Colfax Avenue Corridor. For more information on how to get involved, visit

Implementing BRT along Colfax Avenue does not preclude the long-term vision of having streetcars operating along Colfax Avenue and/or in other areas. The City and County of Denver intends to undertake a transit master plan to help better define the future vision of mobility for all users within and to/from Denver, which will be conducted with extensive public involvement.

DRCOG is responsible for maintaining a model that predicts how travel in the metro area will change in the future if planned projects are completed. As part of this study, RTD and DRCOG, in coordination with the City and County of Denver, have developed a new travel forecasting model (often referred to as the “FOCUS model”) that is a more detailed prediction tool for the region. One of the biggest benefits of the new model is its ability to more accurately account for the role walking and bicycle trips (either exclusively or as part of a trip that includes transit or vehicular travel) play in travel behavior. Give n the strong role that walking and bicycling has in the Colfax Avenue Corridor, the new model is a valuable addition to this project.

The City and County of Denver, RTD and DRCOG are collaborating to complete this study under the guidance of FTA and in coordination with the City of Aurora, the Colorado Department of Transportation (CDOT) and a number of local/state/federal agencies throughout the study area. In addition, the study team has formed a Community Task Force comprised of representatives from registered neighborhood/business organizations, and community leaders to help deepen their engagement with local communities and understanding of the study.

From RTD’s FasTracks system and the redevelopment on and around the Anschutz Medical Campus to other long-range planning studies going on in the study area, there is no shortage of projects to consider. The Colfax Corridor Connections team is in regular communication with all project teams working in the corridor to ensure that the most current and reliable information is informing the study and process.