Grand Coulee, completed in March 1941, was more than a dam — it was a proclamation. After WWII, a vast irrigation project made possible by the dam helped turn the barren deserts of central Washington into rich farmland. But the dam prevented access to one of the greatest salmon rivers in the world. Deprived of the salmon — their most important resource — the native people who lived along the Columbia witnessed a profound cultural decline. Featuring the men and women who lived and worked at Grand Coulee and the native people whose lives were changed, as well as historians and engineers.