The wood you need comes to you automatically when you destroy the third dam support in the far NW of the map. Unfortunately, you don't see any message that you have the wood. If you destroyed the support, look in everyone's inventory, as some party member must have it.
If you didn't destroy the support, go back and do that now.
Then when you get to the gap, just click on it and the wood will go across.
Nightowl2
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