The Sausal Creek Watershed encompasses 2,656 acres in Oakland, California. The headwaters of Sausal Creek arise in the Oakland hills, and the creek flows through the city, discharging into the tidal canal that separates the island of Alameda from Oakland, which in turn flows into San Francisco Bay. For approximately half its length Sausal Creek forms a lush, seemingly natural riparian corridor, unique in this highly urbanized area. For the remainder of its length the creek is mostly culverted or channelized. Although approximately 20 percent of the watershed remains as open space, the watershed is an urban one, ranging from low-density residential development in the hills to a dense mix of commercial and residential uses in the lower reaches. The Sausal Creek Watershed is home to approximately 27,000 inhabitants of diverse backgrounds and cultures—African Americans, Asian Americans, European Americans, Latinos, Pacific Islanders, and Native Americans.