Moses Lake South is a federal irrigation structure located in Grant, Washington, along Crab Creek. Managed by the Bureau of Reclamation, this earth dam stands at a height of 12 feet and was completed in 1962 for the primary purpose of irrigation. With a storage capacity of 50,000 acre-feet, this structure plays a vital role in providing water for agricultural activities in the region.

Although primarily used for irrigation, Moses Lake South also serves recreational purposes, offering opportunities for water-based activities in the area. The dam is classified as having a low hazard potential, with regular inspections conducted by the Bureau of Reclamation to ensure its safety and functionality. Furthermore, the structure has not been modified since its completion, indicating its enduring design and reliability in water resource management.

Located in a picturesque setting and surrounded by nature, Moses Lake South is a significant asset for water resource and climate enthusiasts who are interested in understanding the role of irrigation infrastructure in supporting agricultural practices in the region. With its historical significance and ongoing operational relevance, this federal structure stands as a testament to the importance of sustainable water management practices in Washington State.