Johnson Ranch in Hopland, California, is a privately owned earth dam primarily used for irrigation purposes. The dam stands at a height of 26 feet with a hydraulic height of 18 feet, spanning a length of 680 feet and providing a storage capacity of 182 acre-feet. Located in Mendocino County, this dam is regulated by the California Department of Water Resources for safety and inspection, ensuring its compliance with state jurisdiction and permitting requirements.

Despite being categorized as having a significant hazard potential, Johnson Ranch Dam has been assessed to be in fair condition as of September 2017. The last inspection in February 2020 revealed no major concerns, with the dam meeting regulatory guidelines and operational standards. With a surface area of 14 acres, the dam plays a crucial role in supporting local irrigation needs and contributing to water resource management in the area.

Managed by a private owner, Johnson Ranch Dam is a key infrastructure contributing to water security and agricultural sustainability in the region. As climate change continues to impact water resources, the proper maintenance and regulation of dams like Johnson Ranch become increasingly important to ensure the resilience and efficiency of water management systems in California.