Leonard No. 2 is a privately owned earth dam located in Alturas, California, along the Tr Ash Creek. Built in 1968, this dam serves multiple purposes including flood risk reduction, irrigation, recreation, and water supply. With a height of 26 feet and a storage capacity of 187 acre-feet, Leonard No. 2 plays a crucial role in managing water resources in the region.

Managed by the Natural Resources Conservation Service, this dam has a low hazard potential and is deemed to be in satisfactory condition based on the last assessment in 2017. The inspection frequency is set at once per year, with the last inspection conducted in June 2020. The dam is regulated by the California Department of Water Resources for safety and compliance with state regulations.

Leonard No. 2 serves as a key infrastructure for mitigating flood risks and ensuring water availability for various uses in the area. Its strategic location and design make it an essential component of the water resource management system in Lassen County, California. As climate change continues to impact water availability and extreme weather events, structures like Leonard No. 2 play a critical role in maintaining the resilience of the region's water supply and infrastructure.