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30% Design

The purpose of the planned improvements to South Broadway, Arizona to Exposition and the I-25 Interchange is to create a corridor that provides safe and efficient mobility for all transportation modes (pedestrian, bicycle, transit, and automobile); promote transit-oriented development; and to accommodate the existing, future and planned developments along the South Broadway corridor.

This project consists of the reconstruction of South Broadway from Arizona Avenue to Exposition Avenue, Ohio Avenue from the east approach of Lincoln Street to Broadway, and Mississippi Avenue between the Consolidated Main Line Railway and Logan Street. It includes realignment and reconstruction of three of the I-25 interchange ramps. An extension of Exposition Avenue will be constructed to provide the northern access into RTD’s I-25 & Broadway Station.

South Broadway to be reconstructed and widened to accommodate eight travel lanes, turn lanes, landscaped raised medians and widened sidewalks, which will serve both pedestrians and bicyclists. 

View the South Broadway Typical Section Concept

Initially, in an effort to make the corridor more pedestrian/bicycle friendly, the outside lane in each direction will be utilized for vehicular parking. It will remain this way until it is determined that the lanes are needed to mitigate negative impacts by vehicular traffic.

I-25 Interchange

  • Northbound: Ramps to be reconfigured to improve traffic operations, increase northbound I-25 on-ramp radius and realign northbound off-ramp. (View loop ramp open space concept and loop ramp open space typical section)
  • Southbound: I-25 on-ramp to be replaced with a new ramp “the wedge ramp”, which will improve traffic operations along Broadway. The alignment of this ramp will be different from what is there today. The new alignment will begin at a point along south bound Broadway, just north of I-25. It will continue under the I-25 Viaduct, where it will change direction and head east over Broadway and connect to southbound I-25 where it does today.

Surrounding Roadways

  • Mississippi Avenue: To be reconstructed and widened from Logan Street to the Consolidated Main Line Railway to accommodate turn lanes, raised medians, parking and widened sidewalks  View Mississippi Avenue Typical Section Concept
  • Exposition Avenue: To be reconstructed and widened from Lincoln to Broadway, to accommodate turn lanes, parking on the south side of the street and widened sidewalks.
  • Exposition Avenue Extension: To be constructed west of Broadway to replace the existing Ohio Avenue access into the RTD I-25 & Broadway Station.
  • Ohio Avenue at the I-25 Ramp Terminals: To be reconfigured from South Broadway to the northbound I-25 off-ramp; the reconfiguration will help prevent cut-through traffic in the adjacent residential neighborhood.

Multi-Modal Focus

Pedestrian and Bike Mobility: A priority of the project is pedestrian and bicycle mobility—the ease and comfort by which people can navigate the area on foot and by bike. The project area is at the nexus of many neighborhoods, roads and transit modes. It is surrounded by established neighborhoods and future planned developments that will bring additional residents, visitors, destinations and vehicles to the area. The project team has focused on establishing safe and comfortable places and passages for pedestrians and bicycles traveling through the area, whether connecting to transit, home, work, restaurants, retail, parks or trails. Sidewalks will be continuous and widened to 8 feet or 10 feet; street tree canopies will mature to provide shade and to lend identity to this section of South Broadway; street and pedestrian lighting will appropriately illuminate the corridor; and traffic signalization and street crossings will be coordinated for pedestrian safety. The designated bike route along Logan will be directly connected to a new multi-use trail along the north side of Mississippi and lead west to an access ramp to the South Platte River trail. In areas where there is more generous space beyond the sidewalks, such as under the I-25 viaduct west of Broadway within the wedge ramp and within the loop-shaped I-25 on-ramp serving northbound I-25—the design team has applied a placemaking sensibility to create layered landscapes that establish a human scale and are visually pleasing.
View Multi-Use Paths map (PDF)

More Information

Various city-wide, long-range studies such as  Denver’s Comprehensive Plan adopted in 2000 and  Blueprint Denver adopted in 2002 have been conducted over the past 10 years. These studies identify major transportation corridors such as South Broadway and make strategic recommendations to accommodate Denver’s future growth. These strategies are broken into three major categories:

  • Areas of Change and Areas of Stability - Identifying, managing and focusing direct growth to areas of change and preservation of the character in areas of stability
  • Multi-Modal Streets - Improving the functionality of streets as a means to move people; not just cars
  • Mixed-Use Development – Creating and supporting mixed-use development opportunities that offer and accommodate a variety of transportation options

These studies specifically designate the South Broadway Corridor as an area of change and in need of improvement. Consequently, the National Environmental Policy Act (NEPA) process was set in motion. A number of studies were conducted to analyze and specify improvements and resulting impacts necessary to meet future need, growth and development.

The South Broadway and I-25 System Level Study and Interstate Access Request (30MB pdf) prepared for the Colorado Department of Transportation was released and adopted by the Transportation Commission by resolution (TC-1583) in January 2008.  In March 2008, the South Broadway Environmental Assessment and Section 4 (f) Evaluation (See Below) was approved and released and the following November, the South Broadway Finding of No Significant Impact (FONSI) was approved. 

These documents were the result of a lengthy study and an extensive public outreach process through which alternatives were developed, screened and evaluated, culminating in a thoroughly vetted recommendation for a Preferred Alternative. The planned improvements for South Broadway, Arizona to Exposition and I-25 Interchange project is a direct result of these studies, strategies and recommendations and will ensure this important corridor meets the area’s complex demands.


Contact Us

Mike Harmer, Project Manager

Denver Public Works
(720) 913-4526

Jeanne Sharps, P.E.
Felsburg, Holt, & Ullevig

Nanci Regnier, Public Outreach
Regnier & Associates, Inc.
(303) 680-6849