We followed this route up Castle Creek from Costo Lake. It was really slow, wet and bushwacky with downed timber until we got into the waterfall section before a really steep traverse above a steep face that we decided not to continue on because it was slow moving and we didn’t want to be in the drainage if the weather turned bad. I would maybe attempt again with better weather, but would probably go up the much faster adjacent drainage with a mapped trail instead.
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