I never actually crossed that bridge but that is in along that walk way going from that little park on the Mardyke before St Joseph's primary school
I think it's called Mardyke Bridge. A nice walk from there to the North Mall. I usually park at the car park on the Straight Road and walk past the Kingsley by the river, past the (old) Maltings, Mercy hospital etc. Wouldn't do it at night!