Cargo-carrying by narrow boat diminished from 1945 and the last regular long-distance traffic disappeared in 1970. However, some traffic continued into the 1980s and beyond. Two million tonnes of aggregate were carried on the Grand Union (River Soar) between 1976 and 1996, latterly using wide beam barges. Aggregate continues to be carried between Denham and West Drayton on the (wide) Grand Union Canal and on the tidal estuary of Bow Creek (which is the eventual outflow of the Lee & Stort Navigation).