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.

• Oxford Road culvert replacement: Road maintenance will be replacing a culvert on Oxford Road just east of North 1115th Street starting Monday. Expect single-lane closures and travel delays of 15-minutes or more during working hours, 7 a.m. to 4 p.m., Monday through Thursday. This project is anticipated to last two weeks, weather permitting.

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 June 24. Work hours are 7 a.m.-6 p.m.

• Colo. 119 to Pike Road: South Fordham Street will have directional closures for milling, paving and striping through May 23.

Frederick

• County Road 5 closure: Claystone Construction is installing a new sanitary sewer main to connect Erie’s Summerfield subdivision to the Erie North Water Reclamation Facility northeast of Highway 52 and East County Line Road. The road closure is WCR 5, between Colo. 52 and WCR 16.5. County Road 3.25 and County Road 7 (Aggregate Blvd.) north of Highway 52 will remain open as detour routes. Work will last until the end of May.

• 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 August.

• Lane closure and flagger operations on County Line Road: Duran Construction will return to County Line Road to complete final punch list items and install landscaping and irrigation. Work will occur between Cheesman Street and Telleen Avenue and is expected to continue through Friday, weather permitting. One northbound lane will be closed between intersections as work progresses. Flagger operations will be in place to manage traffic safely through the area. Per the project specifications, lane closures in front of the school — between Moffatt and Cheesman — will be limited to 9 a.m.-3 p.m. to avoid school pick-up and drop-off congestion. In the remainder of the work zone, lane closures may occur from 9 a.m.-4 p.m. Work will begin on the north end of the corridor, just south of Cheesman Street.