The Clarion River, once believed to be the most polluted river in Pennsylvania, is now well on its way to full recovery. Today, the river is recovering from degradation because many people from local industry, government and nonprofit organizations have been working together to restore it for all to enjoy. The main-stem Clarion River’s most recovered portion is in its middle section, from the area of Hallton to just above the Piney Dam impoundment near Clarion. The Clarion River is considered a Class I river. Its characteristics make the Clarion a desirable river for canoeists of all abilities. On a scale of I-VI, the I denotes fast-moving water with riffles and small waves; few or no obstructions, all obvious and easily missed with little training; risk to swimmer is slight; and self-rescue is easy. Keep in mind that classifications can change with high water levels.