Mast is a privately owned dam located in Laytonville, California, along the Tr Cahto Creek. Built in 1963, this Earth-type dam stands at a height of 85 feet and has a storage capacity of 380 acre-feet, primarily used for irrigation and water supply purposes. The dam has a significant hazard potential but is currently in satisfactory condition, as assessed in September 2017.

Managed by the California Department of Water Resources and regulated by the Safety of Dams agency, Mast undergoes regular inspections and enforcement to ensure its structural integrity. The dam spans 580 feet in length and covers a surface area of 14 acres, serving as a vital water resource within Mendocino County. In the event of an emergency, the dam's Emergency Action Plan (EAP) status and risk assessment measures are currently not specified, highlighting the importance of ongoing monitoring and preparedness.

With Congressman Jared Huffman representing the area, Mast plays a crucial role in water management and supply for the region. As water resource and climate enthusiasts, understanding the intricacies of such infrastructure is key to ensuring the sustainability and safety of our water systems. As we continue to navigate challenges such as climate change, monitoring and maintaining dams like Mast will be essential in safeguarding our water resources for future generations.