The Loon Lake Aeration Lagoon, located in Stevens County, Washington, serves as a vital water resource management structure for the region. Completed in 1986, this earth dam is designed to aerate and improve the water quality of the Tr-Loon Lake-Offstream, providing essential support for the local ecosystem. With a storage capacity of 18 acre-feet and a surface area of 1.4 acres, the lagoon plays a crucial role in regulating water flow and maintaining environmental balance.

Managed by the Washington Department of Ecology, the Loon Lake Aeration Lagoon undergoes regular inspections to ensure its structural integrity and operational effectiveness. With a hazard potential categorized as high, the dam is deemed to be in satisfactory condition as of the last assessment in May 2018. The emergency action plan for the structure is continuously updated to meet regulatory guidelines, reflecting a commitment to proactive risk management and disaster preparedness in the event of any unforeseen incidents.

As a key component of the water infrastructure in the area, the Loon Lake Aeration Lagoon highlights the importance of sustainable water resource management and the critical role of aeration in maintaining water quality. With state oversight and regulatory compliance, this earth dam serves as a vital resource for the community and underscores the necessity of ongoing monitoring and maintenance to ensure the continued health and integrity of the surrounding ecosystem.