Waterworks River is a river, at one time a tidal river, in the London Borough of Newham, one of the Bow Back Rivers that flow into the Bow Creek part of the River Lea, which in turn flows into the River Thames.The river is an artificial channel, cut for the Stratford Waterworks (later purchased by the East London Waterworks Company) in 1743, from the Old River Lee channel (above Old Ford Lock), to supply a reservoir at Saynes Mill, Stratford.