Oak Site is a state-regulated dam located in Santa Cruz, California, specifically in the city of Swanton. Built in 1969, this earth dam stands at 43 feet high with a hydraulic height of 37 feet, providing essential water supply for irrigation and domestic use. With a storage capacity of 20 acre-feet and a surface area of 2 acres, Oak Site is a crucial infrastructure that supports water management in the region.

Managed by the California Department of Water Resources (DWR) under the Safety of Dams program, Oak Site has a low hazard potential and is currently in satisfactory condition as of the last assessment in September 2017. The dam is inspected annually to ensure its structural integrity and safe operation. While no emergency action plan (EAP) is currently in place, the dam's risk management measures and guidelines are continuously evaluated to meet safety standards and mitigate potential risks associated with its operations.

Despite its relatively modest size and hazard potential, Oak Site plays a significant role in the local water resource management system. As a vital infrastructure for water supply, this dam serves as a testament to California's commitment to safeguarding its water resources and ensuring the resilience of its hydraulic infrastructure in the face of climate change challenges.