Today, the 150-mile long Big Hole River is one of America's last free-flowing rivers.

It is also the last free-flowing river (un-diverted) in Colorado.

As such Douglas was instrumental in having it preserved as a free-flowing river, left in its natural state.

These dams form a cascade of reservoirs with no stretches of free-flowing river in between.

From that point," he said, "the salmon would have 30 miles of free-flowing river.

Then a day's floating the Yellowstone, the country's longest free-flowing river.

The flow of polluted water in free-flowing natural rivers has blocked the recharging process.

The state, however, may recover the clean free-flowing river that it lost more than 100 years ago, though just how clean is a matter of dispute.

Not so where a free-flowing river meets its bound self.

The Middle Mississippi is a relatively free-flowing river.