Whale Rock, located in Cayucos, California, is a vital water resource structure primarily used for irrigation and water supply purposes. This earth dam stands at a height of 193 feet, with a hydraulic height of 176 feet, and a length of 850 feet. Completed in 1960, Whale Rock has a storage capacity of 40,662 acre-feet and covers a surface area of 594 acres, serving a drainage area of 20.8 square miles.

Managed by a public utility and regulated by the California Department of Water Resources (DWR) under the Safety of Dams program, Whale Rock has a high hazard potential but was assessed to be in satisfactory condition as of September 2017. The dam undergoes regular inspections, with the last one conducted in November 2020, ensuring its safety and reliability for the surrounding community. With its critical role in water supply and irrigation, Whale Rock remains a key infrastructure for water resource management in San Luis Obispo County.

Despite its age, Whale Rock continues to play a crucial role in water management and supply in the region, showcasing the importance of maintaining and monitoring such structures for long-term sustainability. As climate change impacts water resources, the resilience of dams like Whale Rock becomes increasingly significant in mitigating risks and ensuring water availability for agricultural and municipal needs. The careful oversight and maintenance of Whale Rock by regulatory agencies and stakeholders contribute to the overall safety and security of water resources in the area.