13 November 2013
Vermilion Cliffs National Monument

Glen Canyon Dam  is a concrete  arch dam on the  Colorado River in northern  Arizona in the  United States, near the town of  Page. The dam was built to provide  hydroelectricity and flow regulation from the upper Colorado River Basin to the lower. Its  reservoir is called Lake Powell, and is the second largest artificial lake in the country, extending upriver well into  Utah. The dam is named for  Glen Canyon, a colorful series of gorges, most of which now lies under the reservoir.

The dam was proposed in the 1950s as part of the  Colorado River Storage Project, a  U.S. Bureau of Reclamation (USBR) federal water project that would develop reservoir storage on the upper Colorado River and several of its major tributaries. The project's main purpose was to provide water storage to ensure the delivery of sufficient water to the lower basin during years of drought, so as to allow the upper basin to better utilize its allocation of river flow as designated in the 1922  Colorado River Compact. However, problems arose when the USBR proposed to build dams in the federally protected  Echo Park canyon in Utah. After extensive policy disputes and legal challenges with environmental organizations such as the  Sierra Club, they settled for a high dam at Glen Canyon.

Construction of Glen Canyon Dam started in 1956 and was not finished until 1966. When the reservoir filled, the dam began to deliver a regulated flow of water downstream and a supply of electricity to the region. In 1983, major floods nearly led to the dam's collapse, but disaster was averted by a close margin. By suppressing floods and other factors that once characterized the Colorado, the dam has led to major physical and ecological changes in the lower river. Controversy continues over the effects both positive and negative of the dam, which has also been antagonized in many literary works
The Glen Canyon Bridge or Glen Canyon Dam Bridge is a steel arch bridge in  Coconino County,  Arizona, carrying  U.S. Route 89 across the  Colorado River. The bridge was originally built by the  United States Bureau of Reclamation to facilitate transportation of materials for the  Glen Canyon Dam, which lies adjacent to the bridge just 865 feet (264 m) upstream. Carrying two lanes, the bridge rises over 700 feet (210 m) above the river and was the highest arch bridge in the world at the time of its completion in 1959


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