Forests and rangelands of the western United States are vulnerable to environmental stresses and disturbances such as fire, insect infestation, disease, invasive species, drought, and development. These stresses can have significant and long-lasting effects on ecological and socioeconomic values. Land managers need state-of-the-art information and tools that help them anticipate and solve problems. Many geospatial datasets describing these threats to wildlands have been created; what is lacking is comprehensive viewing application displaying and summarizing these threats and their spatial co-occurrence with highly valued resources. This presentation will describe a cooperative effort by the Western Wildlands Environmental Threat Assessment Center (WWETAC) and the Remote Sensing Applications Center to develop a Threat Mapper that will serve as a decision support tool for land managers.