For GIS professionals focusing on St. Louis County, Missouri, our dataset offers detailed information on US Electric Power Transmission Lines. This collection encompasses three primary overhead AC transmission lines, recorded with precise imaging techniques. Key properties include voltage levels, operational statuses, and the respective utilities managing these lines, such as Union Electric Co. and Ameren Illinois Company. Data points also detail connectivity between substations, with examples like Roxford and Coffeen, providing valuable insights for infrastructure analysis and planning in the energy sector. This dataset, derived mainly from aerial imagery and updated till 2016, supports comprehensive studies on regional electric transmission networks.