Plum Canyon, also known as Porter Reservoir, is a privately owned earth dam located in Alturas, California. Built in 1913, this dam serves primarily for irrigation and water supply purposes, with a storage capacity of 184 acre-feet. Situated on Plum Creek, the dam stands at a height of 26 feet and is 270 feet long, covering a surface area of 30 acres in Modoc County.

Managed by the California Department of Water Resources and regulated by the Safety of Dams program, Plum Canyon Dam has a low hazard potential and is deemed to be in satisfactory condition as of the last assessment in 2017. The dam has a hydraulic height of 22 feet and is inspected annually to ensure its structural integrity and safety. With its historical significance and contribution to water management in the region, Plum Canyon Dam stands as a testament to the importance of sustainable water resource management in the face of changing climate conditions.

As a key feature in the San Francisco District's water infrastructure, Plum Canyon Dam plays a crucial role in supporting agriculture and water supply needs in the area. With its long history of service and maintenance, this earth dam continues to provide essential water resources while adhering to state regulations and safety standards. For water resource and climate enthusiasts, Plum Canyon offers a fascinating glimpse into the intersection of human engineering and environmental stewardship in managing and protecting vital water sources.