I Wonder

I'd say it was some kind of flood barrier but not sure they where around then.
 
Perhaps the concrete block is where the brush wielding Troll stood guarding the bridge , stopping unwelcome visitors crossing whilst allowing others to pass , as portrayed in the famous Billy Goats Gruff tale . It stopped Billy Hardcastle , let Goatie Halliwell cross and also Billy Kowalski, who came from Poland and was known as Billy goat Chuff who ran back across the bridge with Compo's wife.
 
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