A structure built at the side or up the face of a dam to enable migration of fish upstream and downstream.
a device constructed to help fish swim upstream to spawn in rivers that have been blocked by dams or other obstructions.
A device made up of a series of pools similar to a staircase that enables fish to migrate upriver past dams.
a stairstepped fishway that helps fish pass over obstacles such as low dams or diversions.
a series of interconnected pools created up the side of a river obstruction, such as a weir, to allow salmon and other fish to pass upstream.
a device to help fish swim around a dam
Series of pools arranged like steps that allow fish to pass upstream over a dam.
a series of pools arranged like steps that fish utilize to move upstream over a dam.
A series of ascending pools, similar to a staircase, that enables fish to migrate up the river past dams. Also called a fishway.
Fishways, most commonly referred to as fish ladders but also known as fish passes, are structures placed on or around human-made barriers (such as dams and weirs) to assist the natural migration of diadromous fishes. Most fishways enable fish to pass around the barrier by swimming and leaping up a series of relatively low steps (hence the term "ladder") into the waters on the other side. The velocity of water falling over the steps has to be great enough to attract the fish to the ladder, but it cannot be so great as to wash fish back downstream or to exhaust them to the point where they cannot continue their journey upriver.