Widebeams are found on the UK waterways, a canal and river system that is managed by the Canal and River Trust (CRT) The Canal and River Trust (CRT) gives more than one minimum width for a wide beam on their website: "anything wider than [ 7 feet ]" in Wide beam, wider considerations and "[A narrowboat is] up to a maximum of 2.2m wide ... [and a widebeam is] up to double the width of a narrowboat or even wider on larger rivers" All craft great and small .