Why is Grand Coulee Dam important to the Columbia River system?

The Grand Coulee Dam is the largest and most complex structure on the Columbia River, serving as a cornerstone for the region's economic and resource management. Its importance to the river system includes:12

• Hydroelectric Power: As one of the world’s largest hydroelectric power plants, it provides massive energy capacity and helps meet peak demand by augmenting low winter flows. Revenue from this power generation funds other critical projects.12
• Irrigation: The dam creates Franklin D. Roosevelt Lake, which supplies water for the Columbia Basin Project. This represents the first large-scale use of the river for irrigation, transforming desert land into productive agricultural areas.2
• System Regulation: It assists in flood control and simplifies navigation along the river.1
• Environmental Mitigation: The dam funds three fish hatcheries to address the loss of Chinook salmon and steelhead populations caused by the obstruction of the river.1