Boulder Dam on the Colorado River is the world's biggest dam, but the Grand Coulee project on the Columbia River will be much bigger. This mighty barrier in the wild heart of Washington, 92 miles west of Spokane, will be not only the world's greatest but the costliest engineering job ever undertaken by man. The dam, power plant and irrigation canals will cost some $400,000,000$25.000,000 more than the Panama Canal. The rampart across the Columbia, which has ten times the annual run-off of the Colorado, will be 4,300 ft. long, 500 ft. high....
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