Twin Pipeline Crossing of the Fraser River

A new creek water supply was developed for the communities of Mission and Matsqui, British Columbia, Canada, in the early eighties. Over 60 kilometres of 450 mm to 900 mm diameter ductile iron pipe, welded steel pipe and concrete cylinder pipe were installed between 1981 to 1989 for gravity conveyance of potable water to an ultimate service population of 200,000 people. Part of the supply system includes about 1,000 metres of underwater crossing of the Fraser River with twin pipelines. The crossing is unique because one pipe is for potable water and the adjacent pipe is for conveyance of sewage.