Lightering (also called lighterage) is the process of transferring cargo between vessels of different sizes, usually between a barge (lighter) and a bulker or oil tanker. Lightering is undertaken to reduce a vessel's draft so it can enter port facilities that cannot accept large fully-loaded ocean-going vessels. Lightering can also refer to the use of a lighter barge for any form of short-distance transport, such as to bring railroad cars across a river. In addition, lightering can refer to the proc…

A lighter is a type of flat-bottomed barge used to transfer goods and passengers to and from moored ships. Lighters were traditionally unpowered and were moved and steered using long oars called "sweeps" and the motive power of water currents. They were operated by skilled workers called lightermen and were a characteristic sight in London's docks until about the 1960s, when technological changes made this form of lightering largely redundant. Unpowered lighters continu…