Access detailed data on electric power transmission lines in Calhoun County, Illinois, tailored for GIS professionals engaged in utility and infrastructure projects. This dataset features three overhead AC transmission lines, characterized by their voltage class (100-161 kV) and captured through various sources, including imagery and OpenStreetMap. Each entry details the operational status, ownership—such as Ameren Illinois Company and Union Electric Co—, and length measurements, providing essential information for accurate mapping and analysis. Professionals will find the dataset useful for tasks requiring precise location data and electrical grid analysis, ensuring thorough planning and management of power transmission assets in the region.