» RWCS : Balcombe Viaduct Created 18-Feb-11 Visitors 54 43 photos Built in 1841, the Ouse Valley Viaduct (also called Balcombe Viaduct ) over the River Ouse on the London-Brighton Railway Line north of Haywards Heath and south of Balcombe is 1,475 feet (450 m) long, 96 feet (29 m) high and