The hydraulically operated segmented gate is 29 meters wide, 11 meters high and weighs around 370 tons. It is supported by 5-meter-wide retaining walls. When it is lowered, it rests on the riverbed so that ships can safely pass over it. In the event of expected flooding, two 12-meter hydraulic arms on either side move it into position. Dillinger steel was chosen for the project because of the special dimensions required and the high demands placed on the lock. Dillinger supplied a total of 470 tons of heavy plate for the innovative flood protection system.

Boston (Lincolnshire) is located on the east coast of the United Kingdom and has always been affected by floods. More than 800 buildings and 55 streets were flooded during the most recent flood in December 2013. The Boston Barrier project is part of a long-term government investment in flood and coastal protection that will provide Boston with one of the best flood protection standards outside London when it is fully completed later this year.