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CDOT: Colo. 119 Boulder Canyon project to be complete December 2020

Monday, December 2, 2019,Colorado Department of Transportation (CDOT) officials announced the Boulder Canyon Colo. 119 project could be complete in a year, weather permitting.

In March, crews began repairing the 15-mile stretch of Colo. 119, also known as Boulder Canyon Drive, between Boulder and Nederland that was damaged during the floods in 2013.

Since blasting began, the road has been closed in both directions for four hours at a time Monday through Thursday. That full closure is slated to end in February, according to CDOT. From February to December 2020, crews will complete the rock armoring, trail work and roadway reconstruction inside single-lane closures. Four-hour closures will not occur during the week of Christmas and New Year’s.

Officials said they eliminated two sections of rock facing and roadway construction in order to get the paving work complete by the end of 2020. If weather prevents paving work next fall, officials said it will take place sometime around May or June 2021.

The project’s work includes resurfacing 13 miles of highway, entirely replacing two miles of highway, building concrete islands to improve the roundabout in Nederland, installing new highway directional and safety signage, replacing pipes conveying stormwater drainage under the highway, scaling rock in areas, repairing shoulder areas, replacing guardrails and more.

The project, in partnership with Boulder County, also includes sections of the Boulder Canyon Trail. The 10-foot wide, multi-use trail will be extended from Fourmile Canyon to Chapman Drive. Two new bike-friendly tunnels under the highway and approximately 3,500 feet will be added to the trail.

To learn about Colo. 119 closures

By email: An email is sent as a traffic advisory when the roadway impacts change on a week-to-week basis. To subscribe to these emails, please email the public information team at

By text: Subscribe to the free texting service by texting CO119 to the number 21000. This service will primarily be used to communicate upcoming closures on the highway.

By phone: The project number (720-500-9912) has an outgoing message that is updated weekly with updates, a summary of impacts to the highway and trail, and estimated delay times through the canyon. The CDOT project web page will be updated with the latest traffic advisory as they are distributed.

On the web: