Leonard Johnson is a privately owned dam located in Alturas, California, along Dry Creek. Built in 1948, this earth dam stands at 18 feet in height and spans 720 feet in length, providing essential water supply for irrigation purposes. Managed by the California Department of Water Resources (DWR) under the Safety of Dams program, the dam is regulated, inspected, and enforced by the state to ensure its safety and functionality.

With a storage capacity of 120 acre-feet, Leonard Johnson serves as a crucial water source for the surrounding area, supporting agricultural activities and local water supply needs. Despite its age, the dam has a low hazard potential and is assessed to be in satisfactory condition as of September 2017. Regular inspections, the most recent one conducted in June 2020, help to monitor the dam's integrity and ensure that it meets safety standards for continued operation.

As a significant infrastructure for water management, Leonard Johnson plays a vital role in the water resource system of Modoc County, California. With its strategic location and purposeful design, this dam exemplifies the importance of sustainable water supply in the face of changing climate patterns and increasing water demands. Enthusiasts of water resources and climate resilience can appreciate the careful regulation and maintenance efforts put into ensuring the functionality and safety of Leonard Johnson for the benefit of the local community and ecosystem.