Cornett is a privately owned dam located in Hopland, Mendocino County, California. Built in 1974, this earth dam stands at a height of 31 feet and has a storage capacity of 65 acre-feet of water from the Tr Russian River. It serves primarily as a water supply source, with a drainage area of 0.09 square miles and a surface area of 6 acres.

Managed by the California Department of Water Resources (DWR), Cornett is regulated and inspected by state authorities to ensure its safety and compliance with regulations. The dam has been designated as having a significant hazard potential, but its condition assessment in 2017 was deemed satisfactory. The last inspection in December 2020 indicated a regular inspection frequency to monitor any changes or potential risks associated with the structure.

With its vital role in providing water supply to the surrounding area, Cornett serves as a crucial infrastructure for water resource management in the region. Enthusiasts of water resources and climate resilience can appreciate the detailed information available on Cornett's design, construction, and regulatory oversight, highlighting the importance of maintaining and monitoring dams to ensure the safety and sustainability of water resources in California.