The Mattole River has been declared by the California Coastal Commission as a 303(d) impaired waterbody that flows into a Marine Protected Area (Punta Gorda State Marine Reserve). Areas in the Mattole River watershed are being restored to revive habitat that was degraded by a combination of early industrial-style timber harvest techniques and associated road construction, naturally erosive geology, and damage by two 100-year floods, which occurred in 1955 and 1964. The Mattole River and Range Partnership, consisting of the Mattole Restoration Council, Mattole Salmon Group, and Sanctuary Forest, undertakes this work with the collaboration of watershed landowners and funding from multiple private and sources.