Blue Marsh Lake is a man-made reservoir located in Berks County, Pennsylvania. It was created by the construction of the Blue Marsh Dam on the Tulpehocken Creek and serves multiple purposes, including flood control, water supply, and recreation. The lake covers approximately 1,150 acres and is surrounded by a scenic landscape, making it a popular destination for outdoor activities. Visitors to Blue Marsh Lake can enjoy various recreational opportunities such as fishing, boating, hiking, and birdwatching. The area features several trails and picnic areas, providing a perfect setting for families and nature enthusiasts. The lake is also home to diverse wildlife, contributing to its ecological significance.