Monticello, also known as Lake Berryessa, is a Federal-owned water resource located in Napa, California. Constructed in 1957 by the Bureau of Reclamation, Monticello serves primarily for irrigation purposes and water supply. The dam, standing at a height of 255 feet, holds a maximum storage capacity of 1,854,819 acre-feet, with a normal storage capacity of 1,602,278 acre-feet.

With a surface area of 20,240 acres and a drainage area of 576 square miles, Monticello plays a crucial role in managing water resources in the region. The dam utilizes an uncontrolled spillway type with a width of 67 feet. The facility has a high hazard potential and undergoes regular inspections by the Bureau of Reclamation to ensure its structural integrity and safety. Despite its age, Monticello continues to be a vital asset for irrigation and water supply needs in the area.

Situated along Putah Creek, Monticello offers a picturesque setting for water resource and climate enthusiasts to explore. With its impressive architectural design and significant storage capacity, Monticello stands as a testament to the ingenuity and importance of water infrastructure in California. As a key component of the region's water management system, Monticello plays a critical role in sustaining agricultural activities and ensuring a reliable water supply for the surrounding communities.