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Nov 24

JC-73 Corridor Study Preliminary Design (Buffalo Park Road to Plettner Lane) Evergreen, CO 80439

Posted on November 24, 2021 at 12:25 PM by Lindsay Townsend

Project Overview:

Jefferson County Road 73 (or JC-73) is the primary travel route for residents of Evergreen between their homes and destinations along State Highway 74 with ultimate connections to I-70 and C-470. Access to US-285 at Conifer is also available along JC-73 to the south of the project corridor. This roadway is a link for hundreds of thousands of visitors each year. In the event of an emergency, it is one of the primary evacuation routes for the foothill residents of Jefferson County. 

JC-73 has long been identified as a road where improvements are needed, especially bike and pedestrian infrastructure, shoulders, and access to properties, businesses, and downtown Evergreen. 

On a previous effort, conceptual designs were presented to the public and a preferred alternative was selected. The preliminary design for the selected alternative is currently being completed and is presented below. The project includes an approximately ½ mile segment of JC-73 between Buffalo Park Road and Plettner Lane. This segment is the last of ongoing bike and safety improvements that have been completed or scheduled for JC-73. However, it is also the most challenging segment due to physical constraints. 

Transportation Improvement Program (TIP) funding has been secured to construct safety and operational improvements including bike lanes / shoulders and pedestrian facilities. The roadway will also be reconstructed, including drainage improvements and bridge replacement.


Link to JC-73 Project Area Map

Link to JC-73 Project Area Map

Preferred Alternative Summary:
The Preferred Corridor and Intersection Alternative was selected based on the compilation of screening criteria shown in the public meeting presentation, public feedback, environmental and geological impacts, available funding, a benefit cost analysis comparing a signalized and roundabout intersection and traffic data. 

To aid in the decision-making process, a community questionnaire was administered to better understand the community concerns, preferences, and priorities for the project area. The public feedback gathered through the comment form indicated the public favored the three-lane corridor concept but had an even split relating to the traffic signal versus roundabout intersection design at Buffalo Park Road and JC-73. 

Based on the screening criteria and responses from the community, the recommended preferred alternative advancing to preliminary design is the three-lane corridor concept and an improved signalized intersection at Buffalo Park Road and JC-73.

Project Schedule:

The project team completed a conceptual design in winter 2020 but was delayed due to state and federal approvals for drainage and historical findings. The project team collected environmental and floodplain data in early 2021 to inform the design. and in May 2021 the preliminary design was initiated. The preliminary design is intended to conclude by the end of 2021, after public outreach has been performed and public input received. 

The next phase, final design, is anticipated to be completed by summer 2022. The construction phase is anticipated to begin early 2023 after right-of-way has been acquired and a contractor awarded. Construction completion is anticipated to be completed by summer 2024.

JC-73 Buffalo Park to Plettner Lane Project Schedule Graphic
Stakeholder Engagement Process:

Your input into the planning process is critical to project success. Due to the ongoing COVID-19 pandemic and maintaining the health and safety of our community, we are seeking input virtually instead of in-person. As a replacement to a traditional open-house meeting, we have created a project video and survey.

The public involvement and feedback received in the previous concept design phase were vital for the selection of a preferred alternative. The project team is currently hosting an additional virtual public meeting for the preliminary design phase. The purpose of this effort is to engage with the public to gather additional feedback on the more advanced design. For specific project information about the preliminary design, please review the documents and project video below (video and pdf version available).

The project video highlights the existing features and traffic conditions along the project corridor, the proposed traffic conditions, and the recommended intersection and corridor improvements. After watching the video and reviewing the documents, please complete a project comment form and tell us your thoughts. 

The comment form will be available until 11:00 p.m., December 31, 2021

Project Video:

Project Video (PDF Version):

See Existing Flyover Video

Provide your input.

For Questions:

Your feedback is valuable in the decision-making process. For questions, please email Mike Vanatta.

Thank you for your interest in this project!