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Detour route for the 8th Ave NW & 24th Street Closure.

Eighth Ave NW & 24th Street Road Closures Planned

June 18, 2025 - WBI has requested an extension for the closure to 8^th Ave NW and 24^th St NW. City Commission approved the request last night. The new three-week shutdown of 8^th Ave NW and one-week shutdown of 24^th St NW will occur between now and July 10. The extension comes after unforeseen circumstances encountered during the initial phases of construction.

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May 21, 2025 — WBI Energy is moving forward with a pipeline improvement project that includes upsizing an existing 12-inch gas transmission line to a 16-inch line. A portion of the work will take place directly west of Mandan High School along Eighth Ave NW.

To safely and efficiently complete the project, WBI Energy has proposed staggered road closures in the area. The following closures are planned:

8^th Ave NW – Closure begins May 27 and is expected to last approximately three weeks.
24^th Street NW – Closure begins June 16 and is expected to last approximately one week.

These closures will take place after the conclusion of Mandan High School’s last day of the academic year on May 23. However, summer school begins May 27, and one of the affected access points is part of the school’s bus loop, which could impact transportation operations. The City of Mandan Engineering Department consulted with Mandan Public School District regarding the proposed timeline. The school district approved the closures on the condition that the work remains limited to the scheduled dates.

The project is primarily being done through the boring process—a method of drilling a hole, tunnel or well in the ground for the purpose of installing underground utilities or gathering samples. Work is not anticipated to disturb the new section of roadway on Eighth Ave NW.

Motorists in the area are encouraged to plan alternate routes and use caution near construction zones.

Detour Map for 8th Ave NW & 24th Street Closure