LowerSanPedro.org Protecting An Ecological Treasure of International Importance A Voice for Volunteer Conservationists The mission of the Lower San Pedro Watershed Alliance is to protect the ecological integrity and associated indigenous cultural heritage of the lower San Pedro region of Arizona primarily through voluntary and effective actions by localcitizens. JOIN US Due to rapid growth in Arizona39s Sun Corridor the San Pedro River is the last remaining major natural and intact river ecosystem in southern Arizona. As a result of its rich biodiversity the lower San Pedro watershed has become the default repository for the mitigation of adverse ecological impacts caused in other parts of the state by such rapid growth. By joining with the LSPWA you help demonstrate that organizing at the watershed level is an important movement in the desert Southwest one that transcends county and community boundaries.