Paterson Ranch Reservoir is a private irrigation reservoir located in Benton County, Washington, offstream from the Columbia River. Built in 2010 by JUB Engineers, this earth dam structure stands at a hydraulic height of 15 feet and has a storage capacity of 46 acre-feet, with a normal storage level of 40.5 acre-feet. With a surface area of 3.4 acres, this reservoir serves the primary purpose of irrigation for agricultural operations in the region.

Despite its small size, Paterson Ranch Reservoir plays a crucial role in supporting the local water resource management efforts. The dam is state-regulated by the Washington Dept of Ecology, ensuring proper inspection, enforcement, and permitting procedures are in place to maintain its operations. The reservoir has a fair condition assessment and a high hazard potential, highlighting the importance of ongoing risk management and emergency preparedness measures.

As a key component of the irrigation infrastructure in the area, Paterson Ranch Reservoir is a vital resource for water supply and agricultural sustainability. Its location in the heart of the Columbia River basin underscores its significance in enhancing water security and climate resilience for the surrounding community. With continued monitoring and maintenance, this reservoir will continue to play a crucial role in supporting the region's water needs for years to come.