A site or corridor selection project is only as good as the data it is built upon. Using ArcGIS products, historical corporate knowledge and publicly available geospatial data, a detailed siting process can be accomplished in a defendable, reproducible, and customizable way. This process will not only identify the most optimum route and/or site, but will also identify potential construction, real estate, and environmental issues associated with the selected sites so that there is adequate time for avoidance or mitigation. This talk will explore some of the frequently accessed public data sources and their uses, as well as a few ArcGIS processes that can help to make the often complex siting processes more automated.