Blue Lake, located in Lassen, California, is a federal-owned water resource managed by the USDA Forest Service. This earthen dam, completed in 1960, serves multiple purposes including fire protection, stock watering, and small fish pond habitat. With a height of 8 feet and a capacity of 600 acre-feet, the dam plays a crucial role in maintaining water supply for various uses in the region.

Despite its low hazard potential, Blue Lake is categorized as having a very high risk assessment due to its critical importance for water supply and ecological purposes. The controlled spillway, valve outlet gates, and regular inspections ensure the dam's safety and functionality. However, the condition assessment remains unrated as of the last inspection in 2011, highlighting the need for ongoing monitoring and maintenance to mitigate potential risks and ensure long-term sustainability.

As a key feature in the San Francisco District's water infrastructure, Blue Lake serves as a vital resource for the local community and wildlife. Its strategic location and purposeful design make it a significant asset for water management, climate resilience, and ecological conservation efforts in the region.