What Defines a Free-Flowing River?

A free-flowing river runs largely unimpeded by human-made barriers such as dams, levees, or weirs along most of its length. These rivers maintain their natural hydrological regimes—seasonal floods, variable flows, and sediment transport—which are essential for healthy aquatic ecosystems. They support high biodiversity, provide critical habitat, and sustain ecological processes like nutrient cycling. Beyond ecology, free-flowing rivers hold cultural, recreational, and economic value for communities.