Located in Grant County, Washington, the Port of Moses Lake Lagoon is a man-made offstream reservoir constructed in 1999 with a primary purpose of "Other." The lagoon, designed by Montgomery Watson, has a dam type of Earth with a structural height of 8 feet and a hydraulic height of 30 feet. With a storage capacity of 34 acre-feet, the lagoon serves as a water resource management facility for the local government.

Managed by the Washington Department of Ecology, the Port of Moses Lake Lagoon is state-regulated, permitted, inspected, and enforced to ensure compliance with environmental regulations. Despite its low hazard potential and "Not Rated" condition assessment, the lagoon plays a crucial role in water conservation and flood control efforts in the region. Its location along Crab Creek makes it an essential component of the local water infrastructure network.

While lacking certain features such as spillways, outlet gates, and locks, the Port of Moses Lake Lagoon remains a key asset for water management in the area. Its strategic design and functionality highlight the importance of sustainable water resource development and climate resilience in the region, making it a significant site for water resource and climate enthusiasts to explore and learn from.