I would assume that when the lock at the falls was working sturgeon could swim up through there. Now that the lock is closed I would assume that this path is closed.
They do have fish ladders there -- which is kinda how the coho get up there.
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plumb2fish
I have heard that sturgeon tend to shy away from the fish ladders on the Columbia, so I would bet very few, if any, use the ladders at Willamette falls.
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eugene1
plumb is right, sturgeon don't like to use ladders.