Looking across Lake Thomson you see this steep imposing wall.  That waterfall seems to appear from nowhere but no mountains are visible behind it.  Turns out that there is another valley up there that isn't visible from here.  In the bottom of that valley is Lake Wade, about half the size of  Lake Thomson, that is feeding the waterfall.  It was misting at this time but later the on the far side of the valley the mists cleared but remained on the near side of the lake.  Later, it was all sun.  Either way, it's good.