lockage

Lockage has nothing to do with a prison. It usually means a boat's passage through a canal lock, or the act of moving the boat up or down between two water levels. In many cases, it can also mean the fee paid for that passage, much like a toll on a waterway.

Historically, canals were important trade routes, and these fees helped maintain them. If you're reading about old industrial waterways, canal travel, or restoration projects, you may come across the term. It is not common in everyday speech, but it still appears when people talk about inland boating, canal systems, and water management.

Lockage refers to several related ideas in the world of inland waterways. Most often, it means the passage of a boat through a lock, or the operation of raising or lowering the boat as water is let in or out of the lock chamber. A lock is an enclosed section of canal or river with gates that helps vessels move between different water levels, and "lockage" can describe that whole movement.

In a business or administrative sense, lockage can also mean the charge paid for using the lock. This fee may depend on the size of the vessel, its cargo, or local rules, and it helps support maintenance of the waterway and its equipment. In technical writing, "a lockage" may also mean the amount of water used or moved during one lock operation.

The word is less common now than it was when canal trade was at its height, but it still appears in writing about boating, canal history, engineering, and heritage waterways, especially in places such as the UK and parts of Europe. For example: "The boat waited its turn for lockage at the canal," or "During the dry summer, the authority reduced daily lockages to save water."