Auckland Viaduct, mechanical bridge

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The Viaduct at Auckland waterfront. This is a  mechanical bridge that can be raised to allow passage into the basin to the fishing vessels which used it.

My water engineer is so sweet, when I asked him is there is a special name for the mechanical bridge, he found the following definition for me. In fact the photos were taken by him.

  

A bascule bridge (sometimes referred to as a drawbridge) is a moveable bridge with a counterweight that continuously balances the span, or "leaf," throughout the entire upward swing in providing clearance for boat traffic.