Eaton H. Magoon Lake, located in Napa, California, is a privately owned Earth dam built in 1965 primarily for water supply purposes, including irrigation and water supply. The dam has a height of 27 feet and a hydraulic height of 22 feet, with a storage capacity of 2762 acre-feet and a surface area of 243 acres. The lake is fed by Routan Creek and serves as a vital resource for the surrounding area.

Despite being privately owned, Eaton H. Magoon Lake is regulated and inspected by the California Department of Water Resources (DWR) for safety compliance. The dam has a high hazard potential and is classified as in fair condition as of the latest assessment in February 2021. The dam has a spillway, although specific details about its type and width are not provided in the data. The last inspection took place in September 2020, with a frequency of once per year.

With its strategic location and crucial role in water supply, Eaton H. Magoon Lake stands as a key reservoir in the region, ensuring a reliable water source for agricultural and domestic needs. As a privately owned structure, the dam is subject to rigorous state regulation and enforcement to maintain its safety and operational integrity. As climate change continues to impact water resources, the management and maintenance of dams like Eaton H. Magoon Lake are essential for ensuring water security and resilience in the face of changing environmental conditions.