Runcorn, city (1991 pop. 63,995), Halton, W England, on the Mersey River. It is located on the Manchester Ship Canal and is the terminus of the Bridgewater Canal, which is connected to the Mersey by a series of locks. The main industry is the production of chemicals. Shipbuilding and ironworks are also important. The city is connected by bridge (2017) to Widnes . Runcorn owes its development chiefly to the construction of the Bridgewater Canal in the 18th cent. It was the site of a castle of Æthelflæd in the 10th cent. Runcorn was one of the new towns designated in the 1960s to accommodate overpopulation in the Liverpool and N Merseyside areas.

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