It is a test of skill for anyone steering a 70-footer.
Part of a tree has come down into the Grand Union Canal in Uxbridge close to The Dolphin pub, and the partially sunken boat on the other side of the canal is not helping matters.
Any passing skipper would have to thread the eye of the needle to get through.
The Gazette has emailed the Canal and River Trust, which looks after the nation's canals, to let staff there know.
Nearby the River Colne is bridged by the tangle of branches and trunks from other fallen trees.
The trend nowadays among countryside managers and the Environment Agency, whose writ runs on nearly all the rivers in this country, is to let nature take its course unless the debris increases the risk of flooding.