The ladder is a series of tiered concrete walls, spanning about 800 feet along the side of the dam, that fish can use to go upstream. The troublesome part of the ladder, at least for the lamprey ...

When Slater Mill opened in 1793, it signaled the eventual demise of river herring and other migratory fish in the Blackstone ...

A recent study looking at 343,000 kilometers of waterways along 6,000 rivers across the Amazon Basin highlights the importance of free-flowing rivers to migratory species of fish and turtles, as ...

Previously, the deserted dam had been preventing the migratory fish from swimming upstream. It also trapped the granite sediment that provided spawning beds for salmon.

But, when the dam was built in the ‘60s, there was no way for salmon and other fish species to scale its walls. The dam cut off 16 miles of the Middle Fork.

Dead invasive fish species washed ashore below the Iron Gate Dam near Hornbrook, Calif., when the dam removal project was underway. Two dams will remain farther upstream on the Klamath to collect ...

That will open the river to Great Lakes species such as sturgeon, walleye and, perhaps someday, Arctic grayling, an iconic native fish that lost in Michigan to overfishing and habitat destruction ...

The ladder is a series of tiered concrete walls, spanning about 800 feet along the side of the dam, that fish can use to go upstream. The troublesome part of the ladder, at least for the lamprey ...