The house furthest up the cove is right near a usually docile stream. But with that much rain in such a short period of time, the stream turned into an angry waterfall with about a Class IV rapid. At first light, I discovered my neighbor's deck boat was ripped loose from his dock, collected the pontoon boat next door, and proceeded to collect my pontoon AND dock and wash them away.
The cluster ended up a couple of hundreds yards down stream. My boat and dock were wedged in with another neighbor's pontoon and dock. The other pontoon that hit mine was nowhere to be found. The owner later found it about a mile away. Unfortunately, the deck boat sunk in the cove.
Here's the aftermath. My boat has the blue cover and it was floating over the sunken deck boat.

Here's the raging waterfall well after the crest of the flash flood. A witness said the deck boat actually rode over top of the fixed dock in the foreground before hitting the pontoon next door.
Miraculously, I can't find any damage to my boat. I untied it from my dock, re-positioned my boat, re-tied it to the dock and dragged the dock back home. I will have to spend about $250 repairing my dock, but I am so very fortunate. They're reporting 11 fatalities (so far), the entire area, probably a million people, are on a boil water advisory that may last more then a week, 10 dams have collapsed so far and hundreds of roads are impassable.
The power of Mother Nature is unbelievable.