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Snail darter, Percina tanasi The snail darter controversy related to the discovery in 1973 of an endangered species during the construction of the Tellico Dam on the Little Tennessee River; the dam project had been authorized and begun before passage of protective environmental legislation.
Construction began in 1979, the main lock opened in 1990, and the full structure was completed in 1994. It replaced the earlier Lock and Dam No. 26, demolished in 1990, and is the first replacement structure on the Upper Mississippi River nine-foot navigation project.
Dams of the Columbia River Basin. Click to view higher resolution and read legend. Hydroelectric generators in the basin sized by capacity. 17 dams on the British Columbia side of Canada-US border not shown. There are more than 60 dams in the Columbia River watershed in the United States and Canada. Tributaries of the Columbia River and their ...
The reservoir of one of Ethiopia's oldest large dams, the Awash dam commissioned in 1966, is close to reaching the end of its useful life due to siltation. While most of the newly constructed dams are much larger than the Awash dam and thus have a longer lifetime, they will also ultimately silt up.
Wing dam in a man-made river bed. A wing dam or wing dike is a man made barrier that, unlike a conventional dam, only extends partway into a river.These structures force water into a fast-moving center channel which reduces the rate of sediment accumulation, while slowing water flow near the riverbanks.
Noxon Rapids Dam is an earthfill gravity-type hydroelectric dam on the Clark Fork river, in the northwest part of the U.S. state of Montana. The dam is located in the far northwest of Montana near the Idaho border. Downriver of Noxon Rapids Dam the Clark Fork is again impounded by the Cabinet Gorge Dam.
The Cleveland Dam is a 91-metre high (299 ft) [1] concrete dam at the head of the Capilano River in Upper Capi [2] lano, North Vancouver, British Columbia, Canada that holds back Capilano Lake, also known as Capilano reservoir.
This made it harder for fish to travel upstream. The report suggested that if eight Gradient Restoration Facilities were installed in the downstream reach, that should be enough to slow the water, allowing sediment to settle and making fish passage easier. [5] A 2005 report considered removing the dam altogether.