The CO 119/Diagonal Highway Safety, Mobility and Bikeway Project is under construction, Boulder County officials announced in a statement Tuesday.

When complete — expected in January 2027 — the Diagonal Highway between Boulder and Longmont will be transformed into a fully multimodal transportation corridor.

Boulder County now has renderings of what the CO 119/Diagonal Highway Safety, Mobility, and Bikeway Project will look like when it is completed.

An interactive map of the 9-mile long project, with zoom-in capabilities allows viewers to see the bus rapid transit stations at 63rd Street and Niwot Road, the bus rapid transit stop at CO 52, and safety improvements and transformation of the intersection at CO 119 and CO 52 (Mineral Road), including the hard surface bikeway.

In early August 2023, Boulder County officials announced the 119 Bikeway project was fully funded and in final design mode, however, the announcement came within a week after United States National Team cyclist-phenom Magnus White died while training on his bicycle while he was riding on 119 at North 63rd Street.

A new sense of urgency to start the 119 Bikeway project became clear after White was struck by an asleep-at-the-wheel driver, and killed on Sunday, July 30, 2023.

“We at Boulder County join the community in grieving the tragic loss of Magnus White,” county officials said in a release in 2023.

Boulder County said the project is a partnership with the Colorado Department of Transportation, the Regional Transportation District, Boulder County, the City of Longmont, and the City of Boulder.