Quite a few in Otaki Forks mate, saw about 15 last time I was in heading up to Waiotauru Hut on the slips in the river. I have also heard there is meant to be a few in Penn Creek in Tararua's but never been there to confirm.
Otherwise there is quite a few in the southern end of the Rimutaka's (up Corner Creek and Mukamuka Stream way).
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