The lower watershed of the Santa Clara River, located entirely within Ventura County, California, encompasses an area of great biological richness. This river system has historically provided habitat for a wide array of native plants and animals and has also supplied humans with water, fish, and fertile farmland. These resources and habitat are increasingly threatened by invasive non-native species and other problems associated with increasing urbanization. The intent of this conservation plan is to focus collaborative, strategic conservation action to abate the main threats to, and enhance the viability of, the watershed's unique natural heritage.