Giffen Reservoir, located in Centerville, California, is a private water supply reservoir primarily used for irrigation purposes. Completed in 1971, this Earth-type dam stands at a height of 29 feet and has a storage capacity of 900 acre-feet. The reservoir covers a surface area of 87 acres and is fed by the Tr Holland Creek, with a drainage area of 1.1 square miles.

Managed by the California Department of Water Resources (DWR) under the Safety of Dams program, Giffen Reservoir is subject to state regulation, permitting, inspection, and enforcement to ensure its safe operation. Despite being classified as having a high hazard potential, the dam's condition assessment in September 2017 deemed it to be satisfactory. Regular inspections are conducted, with the most recent one taking place in April 2020, to ensure the dam's structural integrity and safety measures are up to standard.

With its key role in supplying water for both irrigation and general water needs in the area, Giffen Reservoir serves as a vital resource for Fresno County. Its strategic location and storage capacity make it a crucial asset for managing water resources in the region, highlighting the importance of maintaining its infrastructure and safety standards to safeguard against potential risks and ensure a reliable water supply for the surrounding communities.