CO 119 Diagonal Highway Corridor Project – April 2021

SH 119 First and Final Mile Study LogoCommuting Solutions is currently looking for input on the draft report for the First and Final Mile Study for SH 119, between Boulder and Longmont. The study discusses recommendations that will consider how the stations vary across the corridor, bicycle and pedestrian connections, wayfinding signage, shared parking, microtransit and Transportation Demand Management strategies.

The open comment period will be open from April 19 through May 7.

To read the study, and comment, visit

CO 119 Storymap

Commuting Solutions is excited to produce and provide the CO 119 Storymap. The interactive story map allows users to read about different aspects of the CO 119 corridor project as well as visual aspects of the projects.

Visit the storymap online.

CO 119 in GunbarrelAlternatives Analysis

The initial analysis of the three alternatives for the SH 119 and SH 52 intersection using 2045 traffic volumes has been completed. Based on the level of service outcomes for the three alternatives, CDOT will determine which one CO 119 and SH 52 intersection alternative to move into the broader optimization of the corridor.

The Alternatives Analysis looks at proposed alternatives for the SH 119 Express Lanes and will select a preferred alternative to perform a future year traffic and toll revenue analysis.

The three alternatives include:

  • Alternative 1: Single Intersection with 3 lanes on SH 119 at SH 52
  • Alternative 2: Split Intersection with 2 lanes on SH 119 at SH 52
  • Alternative 3: Split Intersection with 3 lanes on SH 119 at SH 52

CO 119 Safety and Mobility

The CO 119 Safety and Mobility project is underway to evaluate opportunities for improved safety and mobility along the Diagonal Highway from Foothills Parkway to Hover Street in Longmont.

Colorado Department of Transportation and the project team continue to advance survey work and environmental data collection in the corridor.

Over the next few months, the project team will start the subsurface utility investigation and data collection.  All current activities are necessary elements to support the corridor design work scheduled to initiate in the fall 2021.

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