Welcome to Blue Marsh Lake outside of Reading in Berks County, Pa. This is a multi-purpose project built and maintained by the Philadelphia District, U.S. Army Corps of Engineers. The dam was authorized by Congress for flood control, water supply, water quality and recreation.
Construction began in 1974 and was completed in 1979. The reservoir is located on the Tulpehocken Creek and the project’s water control practices benefit the downstream communities of Reading, Birdsboro, Pottstown, Conshohocken and sections of Philadelphia.