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.

Longmont

• Coffman Street: Mobility improvements on northbound Coffman Street from Fourth Avenue to Ninth Avenue and southbound Sixth Avenue to Ninth Avenue will occur until Tuesday. Work hours are 7 a.m.-6 p.m.

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.

• Tipple Parkway turn lane: Turner Construction will begin improvements at Tipple Parkway and Eagle Boulevard, installing a dedicated turn lane to improve traffic flow in the area, on Monday. Traffic will remain open on Tipple Parkway, but lane shifts and access delays are expected. Work will take place weekdays from 7 a.m.-5 p.m. Landscape and striping work will be completed in late 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.

• Concrete work at County Line and Moffat: As part of ongoing ALLO Fiber installation efforts, Vicinity Construction will perform concrete restoration work at the intersection of County Line Road and Moffat Street on Monday. The work will require a single-lane closure between 9 a.m. and 4 p.m. and is expected to be completed within the same day.