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Colorado Department of Transportation (CDOT) Projects on US-287 (Main Street)

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The Colorado Department of Transportation (CDOT) has three intersection safety projects planned for construction in 2020 on US-287 (Main Street). These include the intersections at Pike Road, Grand Avenue and 17th Avenue. A brief overview of each project is below.

US-287 (South Main Street) at Pike Road

This project includes installation of an additional left-turn lane on northbound South Main Street to westbound Pike Road. The additional left-turn lane is intended to improve the safety and efficiency of this intersection. Existing demand for vehicles turning left onto westbound Pike Road from northbound South Main Street often results in large queues, which require a long dedicated left-turn green arrow phase to clear. Less green time will be needed with the second left turn lane, allowing more green time for other movements at the intersection.

To accommodate this additional left-turn lane off of South Main Street, the City of Longmont plans to install a second westbound travel lane on Pike Road from South Main Street to South Coffman Street. All costs up to $685,000 associated with the second westbound lane installation on Pike Road will be reimbursed to the City by CDOT.

No additional right-of-way is required by CDOT to add the second northbound left-turn lane.

Visit the Pike Road Improvements page to learn more about additional improvements planned for 2020.

US-287 (South Main Street) at Grand Avenue

This project includes installation of a raised concrete median at Grand Avenue between northbound and southbound US-287 traffic. This intersection currently allows for full access to all turning movements in its existing configuration. Allowing access to all turning movements creates a total of 32 conflict points between turning movements.

Challenges with navigating this intersection are further compounded by its close proximity to State Highway 119 and nearby business access points. Installing a raised median will cause traffic to enter and exit Grand Avenue and business access points using a right-turn movement only, which significantly reduces the number of conflict points.

No additional right-of-way is required for this project.

US-287 (Main Street) at 17th Avenue

This project includes installation of raised concrete medians both north and south of 17th Avenue between northbound and southbound US-287 traffic. Multiple business access points located immediately north and south of 17th Avenue creates numerous conflict points. Installing a raised median will cause traffic to enter and exit these business access points using a right-turn movement only, which significantly reduces the number of conflict points.

No additional right-of-way is required for this project.

Project Timelines

All three projects will be bid and constructed together. Construction is expected to start in the second quarter of 2020 and last for approximately five months.

Requests for additional information about these CDOT projects and concerns should be directed to CDOT staff:

Ben Raitano, CDOT EIT III
(970) 350-2231

Dan Mattson, CDOT Resident Engineer
(970) 350-2240


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