Pilarcitos, also known as Pilarcitos Lake, is a vital water resource located in Half Moon Bay, California. Owned by the local government, this dam on Pilarcitos Creek was completed in 1866 and serves the primary purpose of water supply. With a height of 103 feet and a hydraulic height of 95.8 feet, Pilarcitos Dam has a storage capacity of 3100 acre-feet and covers a surface area of 109 acres.

Managed by the Department of Water Resources and regulated by the Safety of Dams agency, Pilarcitos Dam is considered to have a high hazard potential but is currently rated as being in satisfactory condition. The last inspection in December 2020 confirmed its structural integrity, and regular inspections are conducted to ensure the safety of the surrounding community. While the dam meets state permitting and enforcement standards, there is no information available on emergency action plans or risk assessment measures for this crucial water source.

Water resource and climate enthusiasts will be intrigued by the historical significance and technical specifications of Pilarcitos Dam. Its location in San Mateo County, California, and its association with Pilarcitos Creek make it a key component of the region's water infrastructure. As a critical water supply source, the dam's condition and regulatory oversight are essential factors in ensuring reliable water access for the surrounding area. Further exploration into the emergency preparedness and risk management aspects of Pilarcitos Dam could provide valuable insights into water resource resilience in the face of climate challenges.