Unfortunately I think the time for that has passed. The initial leverage for maintaining permanent access would have been during the Tongariro power project construction phase, when public assets were constructed/placed at the end of those roads (water intakes/diversions, hydro power stations). There may well be ROW over the roads to enable the Ministry of Electricity and its successors to freely access/work/maintain that infrastructure. But possibly not over the Waipakahi road, as there's only a river level gauge down at the end of the road .
The only other possible period to have negotiated a right of way over the Waipakahi road would have been during the negotiations for the Provincial Growth Fund that paid for a lot of the works carried out. Trouble being I doubt that the public servants dishing out the PGF lollies would have had the foresight or acumen to have made Public Access a condition when doling out public funds in the form of the grant (i.e. for free) for a private Trust and a successful business to make money from.
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