Sumner's Main Rd partially reopens after rockfall chaos disrupts traffic
Sumner's Main Rd has partially reopened after a rockfall forced its closure earlier this week. The incident, triggered by a blocked wastewater pipe, caused rocks and water to tumble onto the road near Rapanui / Shag Rock. Emergency crews and volunteers faced challenges while securing the area, including verbal abuse from frustrated drivers and cyclists.
The road had previously been fully closed for three months in 2024 after a similar rockfall, requiring extensive mitigation work before reopening in November.
The Sumner Volunteer Fire Brigade shut both the road and footpath on Monday after reports of falling debris. A geotechnical assessment later confirmed that a blocked wastewater pipe had destabilised the hillside, dislodging protective wire netting meant to prevent rockfalls. While the Coastal Pathway stayed open, Clifton Tce was reduced to a single lane, with possible further closures for repairs.
One lane of Main Rd has since reopened, though officials warn of potential delays. Traffic is now being managed with manually controlled lights during peak hours. Drivers can still enter and exit Sumner, but congestion remains heavy in both directions.
The 2024 closure lasted from 15 August until 20 November, as the Christchurch City Council and NZ Transport Agency carried out scaling, meshing, and geotechnical upgrades. This time, authorities hope the partial reopening will ease disruption while permanent fixes are finalised.
The road remains under close monitoring, with a low risk of further rockfalls assessed for the reopened lane. Temporary traffic measures will stay in place until repairs to the wastewater system and protective barriers are completed. Drivers are advised to expect ongoing delays and follow signage for safe passage through the area.
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