John Day Dam, USA

The John Day Dam is a concrete gravity dam spanning the Columbia River in the northwestern United States. The dam features a navigation lock plus fish ladders on both sides. The John Day Lock has the highest lift which is 110 feet high. The reservoir impounded by the dam is Lake Umatilla.

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Dalles Dam, Oregon, USA

The Dalles Dam is a concrete-gravity dam spanning the Columbia River, east of the city of The Dalles, Oregon, United States. The Army Corps of Engineers commenced work on the dam in 1952 and completed it five years later. The reservoir behind the dam is named Lake Celilo and runs 39 km up the river channel, to the foot of John Day Dam. 

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Very Large Array (VLA), New Mexico, USA

The Karl G. Jansky Very Large Array (VLA) is a radio astronomy observatory located on the Plains of San Agustin, Socorro County, New Mexico, U.S. Astronomers using the VLA have made key observations of black holes and protoplanetary disks around young stars, discovered magnetic filaments and traced complex gas motions at the Milky Way's center, probed the Universe's cosmological parameters, and provided new knowledge about the physical mechanisms that produce radio emission. The VLA stands at an elevation of 6970 ft above sea level. It is a component of the National Radio Astronomy Observatory (NRAO).

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Mangla Dam, Pakistan

The Mangla Dam is a multipurpose dam located on the Jhelum River in the Mirpur District of Azad Kashmir, Pakistan. It is the 9th largest dam in the world.

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Davis Dam, USA

Davis Dam is constructed on the Colorado River (USA) about 110 km downstream from Hoover Dam. Its height is 60 meters. It stretches across the border between Arizona and Nevada. Davis Dam impounds the Colorado River and forms Lake Mohave.

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Parker Dam, USA

Parker Dam is a concrete arch-gravity dam on Colorado River 249 km downstream of Hoover Dam. Its height is 320 feet. It is the deepest dam in the world. The dam's primary functions are to create a reservoir, and to generate hydroelectric power. It was built between 1934 and 1938 by the Bureau of Reclamation. The dam straddles the border between California and Arizona.

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