The Lake Ontario Lakewide Action and Management Plan (LAMP) is a binational ecosystem- based strategy for protecting and restoring the water quality of Lake Ontario including the connecting Niagara River and St. Lawrence River to the international boundary. This 2019 Annual Report highlights accomplishments and progress during the past year including outreach, monitoring, and protection and restoration actions. The LAMP is developed and implemented by the Lake Ontario Partnership, which is led by the U.S. Environmental Protection Agency and Environment and Climate Change Canada and which facilitates information sharing, sets priorities, and assists in coordinating binational environmental protection and restoration activities. The 2018-2022 Lake Ontario LAMP is now available on binational.net.