and Welham Bridge on the lower river, and near Shiptonthorpe on the upper river. Evidence of Roman settlement has also been found in the river valley, together with villas and kilns used for the production of pottery. Evidence from Saxon times is scant, but the medieval period is represented by historic villages with associated field systems, and turbaries where peat was cut for fuel. Evidence of the 17th century drainers can be seen in the many dykes, drains, bridges, sluices and pumphouses that are a feature of the landscape. The area has become known as the "Valley of the first iron masters", because of extensive iron works dating from the prehistoric period. The location of such remains has been clarified by Hull University, who have been carrying out a landscape archaeology project since 1980. This has concentrated on mapping Iron Age and Roman sites, and has led to the discovery of more iron working sites along the river. A prehistoric log boat was found at Hasholme in 1984, and after excavation and conservation, is on public display at the Hull and East Riding Museum. Prior to the construction of the Market Weighton Canal, the River Foulness continued to flow southwards through Newport and then into Wallingfen, some of marshy ground, where the course of the river could not be discerned. When the canal was built, it used one of the drains in the area to cross the fen, and most of the flow of the river was diverted into it. During the 1960s, localised flooding caused by heavy rain occurred in several places within the catchment of the river and canal, and the solution suggested was to turn both into highland carriers. This involved raising the height of the banks and increasing the depth and width of the channels. Management of water levels within the system is controlled by Weighton Lock, which connects the Market Weighton Canal to the Humber, and the use of it in this way was one of the main factors that led to the withdrawal of the right of navigation on the canal in 1971. Leisure There are very few Public Rights of Way in the river valley. It is not crossed by many roads and there are few major settlements; therefore, leisure activity is limited mainly to angling. Species which can be caught in the lower river include bream, tench, roach, rudd and perch, with