State Highway 1 - Mangamuka Gorge

• Retaining wall construction is underway from late September until late December 2025.
• A 24/7 one-lane closure with stop/go traffic management and speed restrictions is in place.
• The road will reopen to two lanes over the Christmas/New Years holiday period, then return to one lane in January 2026 when work resumes.
• Completion is expected by late May 2026.