Elgin Mill Treatment Lagoon #2 is a private water resource facility located in Union, Oregon. This Earth-type dam was completed in 2017 and stands at a height of 36 feet, providing a storage capacity of 82 acre-feet. The lagoon is regulated and inspected by the Oregon Water Resources Department, ensuring compliance with state regulations for water management.

With its significant hazard potential, Elgin Mill Treatment Lagoon #2 is subject to regular inspections every three years to assess its condition and safety. The last inspection in September 2018 found the dam to be in satisfactory condition, although its overall assessment is currently unrated. Emergency action plans and risk assessment measures are yet to be fully implemented, highlighting the importance of ongoing monitoring and management of this vital water resource infrastructure in the region.

The lagoon, designed by JUB, plays a crucial role in maintaining water quality and storage for the community of Elgin. Situated within the Walla Walla District, it serves as a key element of the local water management system. Climate enthusiasts and water resource experts alike can appreciate the significance of Elgin Mill Treatment Lagoon #2 in ensuring sustainable water supply and environmental protection in the area.