Greystone Reservoir, located in Beverly Hills, California, is a local government-owned offstream water supply reservoir that was completed in 1970. With a dam height of 75 feet and a maximum storage capacity of 60 acre-feet, this reservoir plays a crucial role in providing water to the surrounding area. Despite its high hazard potential, the dam is in satisfactory condition as of the last assessment in September 2017.

Managed by the Department of Water Resources and Safety of Dams in California, Greystone Reservoir is subject to state regulation, permitting, inspection, and enforcement to ensure the safety and reliability of its infrastructure. The reservoir, with a surface area of 2 acres, serves as a vital source of water supply for the region, highlighting its importance in water resource management and climate resilience efforts. Additionally, the reservoir's emergency action plan is regularly updated to meet safety guidelines and mitigate potential risks associated with its operations.

As a key component of the local water supply system, Greystone Reservoir is closely monitored and maintained to uphold its critical role in water management. With its strategic location and significant storage capacity, this reservoir serves as a vital resource for the community, contributing to the overall sustainability and resilience of the region's water infrastructure in the face of changing climate conditions.