The main contractor was Hamilston's Windsor Ironworks Company Limited of Garston, Liverpool. They were tasked with the founding and erection of the pier cylinders on the riverbed, and the erection and riveting of the twenty-one bowstring spans and the swing bridge over the Gloucester and Sharpness Canal. They were also responsible for another swing bridge on the North Docks Branch of the line close to the New Docks at Sharpness. The company manufactured the castings and the wrought-iron structures for the bridge. Project manager George Earle was later given a watch praising his ability and enthusiasm for carrying out the project. The engineers for the project were George Wells Owen and George William Keeling.