Frequently Asked Questions
What is the hole in Lake Berryessa, California?The Glory Hole is a man-made spillway that services the Monticello Dam. When the water in the reservoir gets too high, the spillway redirects the flow of the water underground to prevent it from spilling over the dam.
Can you swim in Lake Berryessa?Yes, swimming is allowed in the lake and is considered safe, except in designated areas. During the summer, the water temperature is great for swimming, often exceeding 80 degrees. There are no lifeguards on duty.