Specially constructed passages that allow fish to go around dams or other barriers are key to migratory fish accessing spawning areas, nurseries and other crucial habitats. On the Atlantic coast, American Shad, Blueback Herring, American Eel and Atlantic Striped Bass all rely on these ladder-like fish roads during their long journeys between the ocean and fresh water rivers and streams. The U.S. Geological Survey, working with states and other partners, helps identify the best location for these