The tidal barrier which will protect thousands of homes and businesses from the risk of flooding.
Work on the 38 million pound project in Ipswich started today and it is due to open in 2016.
The council says it will secure the future of the town, and encourage economic growth.
More top news
Peterborough United boss Grant McCann was delighted by Leo Da Silva Lopes' match-winning display against Bristol Rovers.
Rain clears tonight. Cold and frosty overnight.
The headteacher at a top state school in Hertfordshire has written to parents urging them to lobby the government for more money.