Cull Creek, also known as Cull Canyon Lake, is a vital water resource located in Castro Valley, California. This local government-owned structure serves multiple purposes, including flood risk reduction, recreation, and water supply. Completed in 1963, the earth dam has a height of 55 feet and a hydraulic height of 36.7 feet, with a storage capacity of 140 acre-feet and a surface area of 18 acres. The dam plays a crucial role in managing the drainage area of 6.2 square miles, with a high hazard potential but a satisfactory condition assessment as of September 2017.

Managed by the California Department of Water Resources (DWR) under the Safety of Dams program, Cull Creek Dam is regulated, permitted, inspected, and enforced by the state, ensuring its compliance with safety standards. The dam's location in Alameda County, under the jurisdiction of the Sacramento District, highlights its importance in flood risk reduction for the surrounding area. With Congressman Eric Swalwell representing the district, the dam's emergency action plan (EAP) readiness and risk management measures are crucial in preparing for any potential disasters.

Despite its high hazard potential, Cull Creek Dam continues to provide essential flood protection and recreational opportunities for the community. With regular inspections and a satisfactory condition assessment, the dam stands as a reliable water resource in the region. As climate change impacts water resources, the management and maintenance of structures like Cull Creek Dam are vital in ensuring the safety and sustainability of our water supply systems in the face of evolving environmental challenges.