主工程是费时三年修建拦腰隔断科罗拉多河的格伦峡谷大坝（Glen Canyon Dam），大坝高达900英尺，虽比美国最高的胡佛大坝低5米，但要长近100米，从整个坝体的体积来说是美国最大的水坝。
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1996年，科学家从大峡谷上方的格伦峡谷大坝放水，造成科罗拉多河实验性洪水。
In 1996, scientists caused an experimental flood of the Colorado River by releasing water from Glen Canyon Dam above the Grand Canyon.
环保组织现在很可能会强制拆除掉两座重要大坝——科罗拉多的格伦峡谷大坝和约塞米蒂的赫奇赫奇大坝。
Environmental groups now have a very good chance of forcing the removal of two major dams, the Glen Canyon Dam on the Colorado and the Hetch Hetchy Dam in Yosemite.
库存科罗拉多河水的格伦峡谷大坝自3月4日已开闸数天，以填充河道的泥沙高度。
Glen Canyon dam, which impounds the waters of the Colorado river, was opened for several days starting on March 4th in order to replenish the river's sediment levels.
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