This page provides an overview of the large road and bridge projects currently under construction or design. These transportation projects are part of the City's Capital Improvement Program.

The City of Longmont provides information to help those who may be affected by these large construction projects. Find information on how we support impacted businesses and keep residents informed.

You can find information about general road closures by visiting our Cone Zones and Closures webpage.

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Projects in Planning and Design

Boston Avenue & Sunset Street Project

Boulder County Transportation in partnership with the City of Longmont is planning to reconstruct both Sunset Street and Boston Street in a section of unincorporated Boulder County located within Longmont.

Southwest Longmont Operations Study

Examining Ken Pratt, Hover, and Nelson, this study will identify needed improvements for cars, bikes and pedestrians.

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Projects Under Construction

South Pratt Parkway Bridge over St. Vrain Creek

The bridge is approaching the end of its useful life. It is too narrow for the traffic volumes that cross it daily, classifying it as “functionally obsolete” per the Colorado Department of Transportation's biannual bridge reports.

Pavement Management Program

The City’s annual Pavement Management Program contracts with private sector contractors for replacement of broken curbs and sidewalks, preventive maintenance such as crack sealing, chip sealing and pavement overlay and reconstruction.

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Projects Recently Completed

Boston Avenue Connection

This project included the design and construction of a new roadway from Main Street (US 287) eastward connecting to Martin Street.

Downtown Alley Improvements

Construction focused on the alleys, breezeways and parking lots to further support the growth and development of downtown Longmont.

Focus on South Main

"Focus on South Main" was a multi-year effort intended to improve the southeastern gateway to Longmont’s core along Main Street. There were three components that comprised the Focus on South Main effort: Main Street and Ken Pratt Boulevard Intersection Improvements, Main Street Bridge Replacement at St. Vrain Creek, and Main Street Pavement Reconstruction.

2016/2017 Pedestrian Underpass Projects

This project provided two, new pedestrian/bicycle connections:

1. between Dry Creek Drive and Pike Road
2. at Hover Street and Dry Creek