CO 119 November 2021 Update: Traffic Alternatives Study, CO 119 Bikeway Project

Traffic Alternatives Study

The High Performance Traffic Enterprise (HPTE) commissioned the Traffic Alternatives Study, a cost benefit analysis, to identify the transit priority improvement with the greatest benefit for the Colorado Highway 119 corridor from Boulder to Longmont based upon year 2045 conditions.

Alternatives included no-build, intersection improvements at CO 52, Hover, and Airport, three general purpose lanes, queue-jump lanes and tolled express lane options. The alternatives were scored based on how well they improve safety, maximize intersection and corridor-wide operational efficiency, maximize the number of people able to move through the corridor, improve transit travel times and improve connectivity to the bicycle and pedestrian network.

Current budget and cost considerations were also factored into the evaluation process.

The analysis showed that Intersection Improvements at CO 52, Hover, Airport and Queue-Jump Lanes provide the greatest benefit for safety and mobility through the year 2045.

These improvements will be implemented through CDOT’s and RTD’s Safety and Mobility Project, which will go into design before the end of the year.


CO 119 Bikeway Project

Boulder County has just completed the first public comment period for the CO 119 Diagonal Bikeway project. More than 1000 survey responses and 45 comment forms were received, and meeting attendees asked dozens of questions and comments during the virtual meeting.

The County 119 Bikeway webpage just posted an FAQ with responses to the most common comments and questions that were received.

For those who want more details on the proposed design of the bikeway, the Design Validation Memo includes the why and how we are refining the draft alignments presented in the Concept Plan.

We are now starting extensive field work that includes:

  • Map of utilities, trees, culverts, irrigation ditches. This will show what needs to be moved, redesigned or needs to be worked around.
  • If threatened or endangered wildlife species live or migrate through the project area
  • Noxious weed inventory
  • If there are any hazardous materials in the corridor
  • Historic resources
  • Soil sampling and groundwater measurements. This is important so the bikeway won’t sink, or buckle and underpasses won’t flood
  • Traffic study: this is important to design safe at- grade crossings are safe and utilize features such as bicycle detection and rapid flashing beacons and pedestrian medians

As soon as the field work is done the Boulder County Bikeway Project team will combine the information gathered with the guidance set in the Design Validation Memo for a more detailed alignment of the bikeway. We expect to have this completed in April and will again ask for your feedback, ideas, and questions.

In the meantime, feel free to continue to send in questions and comments using the comment form.

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Commuting Solutions
CO 119 Membership Meeting

April 24, 2024  | 8:00 – 9:30 a.m.
At Hampton Inn & Suites, Boulder North