Picking lumber from water

[Zebnon]

i can pick it from water, when i am in boat. But can`t drop ("You can`t place this on water"). only relogging helpes.

[Cookie]

If you don't have cargo in your boat you can put it in your boat. Your boat will hold two logs when the cargo spaces are empty.

If you steer your boat to the shore you can sometimes, maybe, rarely manage to put it down on the shore but this generally doesn't work.

[Granger]

Also noted here in the first section.