The lake was formed by flooding the town of Monticello in the 1950s, leaving much of the original town structures submerged.
The Glory Hole spillway has a drop of approximately 200 feet into the base of the Monticello Dam.
The reservoir is one of the largest in California, with a shoreline stretching over 165 miles.
During extreme drought conditions, ruins of the town of Monticello, including building foundations and tree stumps, can occasionally be seen.
The lake is a primary water source for the Solano County Water Agency.
Lake Berryessa is a 20,000-acre reservoir located in Napa County, California, primarily recognized for its large-scale water-based recreation and the Monticello Dam. The reservoir was created by the Bureau of Reclamation to provide water storage and hydroelectric power. It features the 'Glory Hole,' a 72-foot diameter bell-mouth spillway designed to drain excess water when the lake reaches capacity. The landscape is characterized by Mediterranean grasslands and oak woodlands surrounding the shoreline. It serves as a major hub for fishing, specifically for smallmouth and largemouth bass, and trout. Visitors utilize the area for houseboating, swimming, and waterskiing throughout the warmer months. Several public boat launches are maintained along the eastern and western shores. The lake level fluctuates significantly based on seasonal precipitation and regional water management needs.
The scenic overlook near the Monticello Dam provides the best view of the spillway and lake expanse.
Bring polarized sunglasses to reduce glare on the water for better fishing and sight-seeing.
Secure all trash and gear, as the area experiences high winds that can blow items into the water.
Check local water quality reports before swimming, as toxic algae blooms can occasionally occur in late summer.
Attempting to swim near the Monticello Dam or the Glory Hole spillway is strictly prohibited and dangerous.
Recreation areas remain open year-round, but water-based amenities may be restricted during low water levels.
Practice 'Leave No Trace' principles; pack out all trash and respect wildlife habitats.
