Lake Berryessa is a large reservoir located in Napa County, California. It was created in the 1950s by the construction of the Monticello Dam on the Putah Creek. The lake covers approximately 1,600 acres and has a maximum depth of about 220 feet, making it a popular destination for boating, fishing, and swimming. The surrounding area features scenic hills and vineyards, contributing to the natural beauty of the region. Lake Berryessa is also known for its unique feature, the Glory Hole, an impressive spillway that resembles a giant drain when the water level is high.