Tesla Effect: Swamphouse

Not sure what day it is, but I've arrived at the swamp house. I need to find 5 planks to repair a ladder. I found 3 lying around on the ground, and a 4th floating in the stream, but for the life of me I cant find the 5th plank. Ive spent three days here and really need some help. Im playing in causal mode, and I've used the flashlight on every inch of ground. The "hints" just tell me to find the 5 planks. Can anyone help?

That's the one I had trouble finding, and I finally found the board I couldn't find near the bridge, I kind of swung the curser back forth to the left of the bridge. I can't remember exactly but hope this works.
Charllotte

Charllotte, you have saved my sanity. I don't think I could have found it without your help, your suggestion to "swing" the cursor near the bridge was excellent... Thanks again!