Just as a follow up, there is a hole where the boat that's floating is. We missed this hole by 4 feet. That combined with an unusual (that's what we're telling ourselves) wind that day resulted in what you see.
We were able to push the sled off though... amazingly, and only because three passerbys stopped and asked if we needed help.
It was a great day though.
This happened two years or so ago... not this weekend.