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Catch the boat to the south-eastern side of the lake and travel south to Gorilla Stream, some parties have crossed the Tasman River near to Gorilla Stream – but this may not be possible in summer). Follow Gorilla Stream and ascend easily up the glacier to the summit. The last bit to the top is a bit exposed. The top offers a glorious viewpoint. At the head of Gorilla Stream a bivvy rock offers a small amount of protection (take a fly to add to it). From the lake to the bivvy rock allow ~6hrs.
Gorilla Stream Route
Peter Graham, Mick Collett, Dr Mackay, 1905