Grand Coulee, located in Okanogan, Washington, is a concrete gravity dam on the Columbia River that was completed in 1941 by the Bureau of Reclamation. Standing at a height of 550 feet with a hydraulic height of 380 feet, this dam serves the primary purpose of flood risk reduction along with irrigation. With a normal storage capacity of 9,562,000 acre-feet and a maximum discharge of 265,000 cubic feet per second, Grand Coulee plays a crucial role in managing water resources in the region.

Owned and operated by the Bureau of Reclamation, Grand Coulee is a significant structure with a high hazard potential and very high risk assessment. The dam spans a length of 5,673 feet and has a spillway width of 1,485 feet, showcasing its impressive scale and engineering design. While the condition assessment of the dam is not available, regular inspections and emergency action plans are in place to ensure its safety and reliability in the face of potential hazards.

As a key component of the water infrastructure in the area, Grand Coulee contributes to the management of the Columbia River and plays a vital role in water supply, flood control, and irrigation for the region. With its strategic location and impressive specifications, this dam stands as a testament to human ingenuity in harnessing and managing water resources amidst changing climatic conditions.