The Saugus Iron Works National Historic Site (site) conducted an invasive plant survey during the summer of 2003 to generate baseline data in order to manage and assess the spatial impact of invasive plants. The primary goals of this study: 1) determine which invasive plant species inhabit the site; 2) determine the percent cover and density of the dominant invasive plant species; and 3) map where the dominant invasive plant species occur within the site.