- a series of ascending pools constructed to enable salmon or other fish to swim upstream around or over a dam.
Origin of fish ladder
An Americanism dating back to 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for fish ladder
There's more good water—two miles of it—to the east, and all it needed was a fish-ladder around Scaur Falls.The Flaming Jewel
Robert W. Chambers
- a row of ascending pools or weirs connected by short falls to allow fish to pass barrages or dams