Boulder

• 28th Street improvements — Pearl to Iris: This project will improve multimodal travel along 28th Street from Pearl to Iris. Northbound 28th and Valmont Road RTD Stop #17992 serving 205 and BOLT routes will be temporarily relocated to just south of the Valmont intersection until Dec. 31.

• 19th Street and Fourmile Canyon Creek Underpass: Crews will begin replacing the bridge over Fourmile Canyon Creek and construct a bike/pedestrian underpass. Northbound RTD 204 bus stops at Riverside and Upland will be temporarily closed. Work is anticipated to end March 2, 2026.

• 28th and Colorado protected intersection: This project is to install a protected intersection, sidewalk-level protected bike lanes and bus lanes. There will be lane closures where work is occurring, as needed. Expect delays, pedestrian and bike detours when traveling in the area. Work is expected to be completed June 30.

• 63rd waterline replacement: Both lanes of traffic on 63rd Street between Gunbarrel Avenue to the 63rd Street railroad crossing will shift to the east side of 63rd Street. Work hours are 7 a.m.-5 p.m. Monday-Friday and it is expected to be completed by June 29.

• 11th Street and Canyon Boulevard stormwater improvements: This is a city-led project resolving a utility conflict between the storm sewer and sanitary sewer. Westbound lanes on Canyon Boulevard from Broadway to Ninth Street will be closed. Work will take place through Friday.

• Sixth Street bridge maintenance: The city will conduct structural repairs on the surface and beneath the Sixth Street bridge, including waterproofing, HMA overlay and tree trimming.A full road closure during surface work, and path closure during work beneath the bridge will be required. Work will be conducted 8 a.m.-5 p.m. through June 30.

Boulder County

• Colo. 119 safety, mobility and bikeway construction: CDOT will begin work on Colo. 119/Diagonal Highway. This project is anticipated to be completed in spring 2027.

Frederick

• Waterline installation: Thalle Construction is installing a 42-inch waterline as part of the Thornton Water Project. The waterline will pass through two miles of the Frederick Planning Area. The pipeline will be installed at a depth of at least 4 1/2 feet, with crossings under WCR 14 and WCR 16 at 6 feet deep. To install the pipeline, planned 72-hour road closures will be necessary WCR 14 in mid-March, WCR 17 in mid-June and WCR 16 in early July.

Erie

• WCR 7 waterline improvements: The town of Erie is working on the WCR 7 Waterline Improvements project. This project will install a new transmission waterline to secure the future delivery of potable water, impacting approximately 2.7 miles of WCR 7 and requiring significant traffic changes. Expect full closures between WCR 12 and Colo. 52, and single-lane traffic south to Erie Parkway through mid-August.