The Maitai Valley Rd will be closed to motorists, cyclists and walkers from just past the motor camp to the Maitai Dam from Tuesday.
Nelson City Council network services executive manager Alec Louverdis said the closure was to allow construction of the next phase of the $12 million duplicate Maitai water pipeline.
The road is expected to be closed until July next year. Access to the Dun Mountain Cycle Trail will be via a temporary tramping and cycling track. Parking will be near the motor camp and will be well signposted, with directions to the new temporary trail also clearly marked.
The new 8km duplicate pipeline will eventually replace the ageing above-ground pipeline, which will remain in operation to provide security to the city's water supply.
The project began a year ago and is scheduled to take three years to complete.
Ten kilometres of new pipeline has been laid beneath the service road from the Maitai Dam to a point near the former Maitai Baptist camp.
The project is Nelson's largest water supply infrastructure project since the $26m water treatment plant was built at the Tantragee. The original pipeline was installed when the Maitai water supply scheme was built in the mid-1980s.
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