The boat probably lay there already for the Orcs uses, maybe for if they needed to get across the lake in haste. I think I recall in the Hobbit that the entrance where Bilbo came to the lake wasn't the only entrance to the lake. So, maybe the Orcs used the lake as a shortcut.
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'You?' cried Frodo.
'Yes, I, Gandalf the Grey,' said the wizard solemnly. 'There are many powers in the world, for good or for evil. Some are greater than I am. Against some I have not yet been measured. But my time is coming.'
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