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Part of Rochester Pier collapsed into the River Medway early this morning.
It's thought the historic jetty, which has been deteriorating for years, finally broke free when the tide changed between 4am and 5am.
It has been out of use since Medway Council closed it about two years ago with a sign warning: "Dangerous Structure. Do Not Enter."
Dennis Welsh, mooring master from Rochester Cruising Club, said: "It has been slipping into the mud for the last six to seven weeks – and it was obvious it was going to go."
In recent years, the Edith May sailing barge has moored there during the summer, offering afternoon teas on board.
Jet Stream boat operators has also run river trips up the river taking in Upnor Castle and Chatham Historic Dockyard.