A severe storm with conditions described as "horrendous" has battered Guernsey's east coast overnight.
Alderney coastal defences were attacked by huge waves, although the roads and buildings remained flood free.
Guernsey suffered as wind speeds hit Storm Force 10 - with ten trees downed around the island.
Parked cars floated from their spaces as flooding caused the closure of the bulk of the coast road, between Bulwer Avenue and the Val De Terres.
The Rohais Du Haut, Saline Road and the Hougue Mague are still closed but police said the rest of Guernsey's main roads were now clear.
Chad Murray, the harbourmaster in Guernsey, said: "Some of the boats that had been laid up for winter maintenance have now fallen off their blocks and are lying on their side.
"Others are precariously balanced, so we've had to close off the area."
Castle Emplacement was one of the worst hit areas.
Police described conditions on Guernsey overnight as "horrendous" with "extensive damage" in the Castle Emplacement area.
About 300 homes in St Peter Port lost power during the height of the storm after an electricity sub-station flooded.