Ice Bridge Definition

noun
An ice control structure on a river, to control flowing river ice, that spans the breadth of the river, and may have a traversable roadway on top.
Wiktionary

A type of ice road , a floating-bridge-like roadway made of floating ice atop a body of water.

Wiktionary

A type of ice road , a causeway-like road across a body of water, made of full-depth ice, where from the road surface to the lakebed/riverbed is solid ice.

Wiktionary