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28th Street Improvements Project

28th Street Improvements Project

28th Street is a gateway to Boulder for employees, visitors, students, and residents. Once the 28th Street Improvements Project is completed, 28th Street from Baseline Road to Iris Avenue will be transformed into a multimodal corridor  with unique transportation, safety, aesthetic and economic enhancements.

Project Update

Upcoming Project: Canyon Blvd to Iris Avenue

28th St Project Timeline Iris to Canyon

The following improvements will be constructed along this segment:  

  • a bus/bike/right-turn only lane (third outside lane added) in each direction along 28th Street;
  • complete gaps in the existing multi-use paths by constructing ten-feet wide concrete multi-use paths where needed;
  • install landscape buffers between the street and the multi-use paths;
  • mid-block pedestrian crossings, signals and raised crossings;
  • raised crossings at some intersections;
  • install street trees throughout the project length;
  • new replacement traffic signals on 28th Street at Mapleton Avenue and Glenwood Drive
  • storm drainage upgrades and utility relocations

Left-turn lanes have already been added on 28th Street at the intersections of Pearl Street, Valmont Road, and Iris Avenue.

Take a look at the 28th Street Improvements current project plans. pdf

SH 119 Project Integration

The constructed improvements will sync with the regional  State Highway 119 Bus Rapid Transit (BRT) Project , which will include the addition of a managed/express lane and construction of a paved bikeway (view the route here ) from Boulder to Longmont. BRT stations will be installed at Iris, Valmont, Pearl and Canyon in conjunction with the 28th Street Improvements Project.

This BRT project is spearheaded by a coalition comprised of the City of Boulder, City of Longmont, Boulder County and Commuting Solutions. Also involved in the planning and process are RTD, CDOT, High Performance Transportation Enterprise (HPTE) and the local area chambers. 


Completed Projects


Iris to Yarmouth Avenues

A new 10-foot-wide multi-use path along the west side of 28th Street between Iris Avenue and Fourmile Canyon Creek, pedestrian and bicycle bridge over Fourmile Canyon Creek and continuous on-street bike facility on 28th Street between Iris and Yarmouth avenues was completed in 2015. These improvements provide an improved multimodal transportation system with expanded travel options for students and their families, staff, residents, employees and others traveling through the area. Public art at the bridge and southbound bus stop beautify this bicycle and pedestrian improvement.  Funding for this section of 28th Street was provided through a Federal Transportation Improvement Program (TIP) grant  and city Transportation funds.

Final Design Concept for the 28th Street Improvements (Iris to Yarmouth Avenues) pdf

The 28th Street (Iris to Yarmouth Avenues) Bicycle and Pedestrian Improvements pdf  was reviewed through the city's Community and Environmental Assessment Process (CEAP). A public hearing was held at the May 13, 2013 Transportation Advisory Board (TAB) meeting and the board recommended approval of the project CEAP and recommended design options. The CEAP document was forwarded to City Council for potential call-up by July 16, 2013. Since the CEAP was not called up at that time, the project is proceeding toward final design.


Violet Avenue & US 36 Intersection  Re-alignment

To improve safety at the intersection of Violet Avenue and US 36, a popular route for drivers and on-street cyclists with a history of fatal collisions--the intersection was reconstructed so that Violet Avenue meets US-36 at a right angle. This improves sightlines and visibility for both drivers and cyclists. A five foot wide sidewalk on the south side of Violet Avenue from 23rd Street to US-36 and a pedestrian median at US-36 was also installed through this project. In addition to the re-alignment and pedestrian improvements, this project closed the section of Violet Avenue from 26th to 28th streets to simplify and further improve the safety of this intersection.


Middle Section (Arapahoe Avenue to Valmont Road)


The multimodal improvements include new sections of multi-use path along the west side of 28th Street between Arapahoe Avenue and Valmont Road; and a shared bus/bike/right-turn lane and new multi-use path along the east side of 28th Street between Pearl Street and Valmont Road.

South Section (Baseline Road to Arapahoe Avenue)

Construction of the south section between Baseline Road and Arapahoe Avenue was completed in phases. Phases one and two were completed by fall 2006 and included new bike lanes, transit stops, improved roadway lighting, and construction of a sidewalk on the east side of the 28th Street Frontage Road. Phase three was completed at the end of 2012 and included construction of a multi-use path along the west side of 28th Street between Colorado Avenue and Baseline Road.

Related plans:

28th Street Frontage Road Transportation Connections Plan pdf

Project Goals


New Gateway with “Smart” Aesthetics
28th Street is transforming into an attractive and appealing gateway that combines functional art, water-wise landscaping, and improved signage and landmarks.

Improved Transportation (Complete Streets)
The multimodal transportation system increases safety to better accommodate travel for pedestrians, bicyclists, transit riders and drivers.

Expanded Travel Options
The improvements provide roadway enhancements, better lighting, improved transit stops, and expanded bus services, bike lanes, sidewalks, and multi-use paths.

Retaining Wall with "Strata Variations"
The retaining wall between Colorado Avenue and Taft Drive was built to stabilize the hillside and the "Strata Variations" public art was incorporated into the retaining wall.

Water-wise Landscaping
Drought-resistant landscaping such as fertile grasses, shrubbery and trees requires little maintenance. The new irrigation system and wood mulch dramatically reduce water loss, surface runoff and weed growth. This system is designed to allow the city to selectively irrigate portions of the landscaping in possible drought conditions.

Regional Connections
28th Street links CU, the Twenty Ninth Street retail district, the Boulder Junction area, local and regional transit routes, bus transit superstops, and FasTracks. The improvements strengthen multimodal travel throughout the region.

Economic Vitality
The new 28th Street encourages private investments by improving access to businesses and adding value to existing ventures such as the Twenty Ninth Street retail district.

The Boulder Convention & Visitors Bureau has put up colorful banners to encourage people to shop, dine and enjoy their time in our city. CU’s 28th Street Landscape Development Master Plan calls for enhancements on its eastern boundary, which include new outdoor basketball courts with sunken bleacher seating and possibly flower gardens.

Leveraged Funds
More than 50 percent of the funding for the south section improvements came from state and federal sources and the rest came from the city’s transportation fund.

The upcoming improvements along the Arapahoe Avenue to Valmont Road section of 28th Street is a combination of Capital Improvement Bond funding and city transportation funding. The improvements on 28 th Street/US 36 (Iris-Yarmouth) are a combination of federal and city transportation funding.


These improvements have been funded with a number of sources, including city transportation funds, state transportation funds, federal transportation funds and the 2011 voter-approved Capital Improvement Bond.

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Related Videos

28th Street Improvements Project on Inside Boulder