Heenan Lake, located in Alpine County, California, is a state-regulated reservoir with a primary purpose of water supply for irrigation and domestic use. The dam, completed in 1929, is an earth structure standing at a height of 39 feet, with a hydraulic height of 33.5 feet. The reservoir has a storage capacity of 3,100 acre-feet and covers a surface area of 124 acres, drawing water from the East Fork Carson River.

With a low hazard potential and a satisfactory condition assessment as of September 2017, Heenan Lake provides a reliable water source for the surrounding area. The dam has been inspected regularly, with the last inspection conducted in October 2020, ensuring its structural integrity and safety. As a critical infrastructure managed by the California Department of Water Resources (DWR), Heenan Lake plays a crucial role in water resource management in the region.

Enthusiasts of water resources and climate will appreciate Heenan Lake not only for its functional importance but also for its ecological significance. The reservoir supports a diverse ecosystem and provides recreational opportunities for visitors. Its management by state agencies, including regular inspections and regulatory oversight, highlights the commitment to maintaining a sustainable water supply while protecting the environment.