Project Description

Pennsylvania Power and Light (PPL) owns power transmission lines that cross the Susquehanna River, which is over a mile wide in some areas. Transmission towers are constructed in the middle of the river in some locations to support the transmission line span. The transmission line tower in the middle of the river near the Safe Harbor Dam was built in the 1940s. Limited information was available regarding how the tower was constructed. CGC Geoservices performed core samples of the concrete foundations as well as rock coring at the base of the tower in the middle of the river, immediately downstream of a hydroelectric dam. The project was challenging to access due to rocky conditions and water depths that varied from 6 inches to 6 feet over the course of the day depending upon water flows through the dam.