Science

See inside Glen Canyon Dam as Lake Powell levels drop

This article was originally featured on High Country News.

Glen Canyon Dam was built primarily to store excess Colorado River water during wet years, so it could be released during dry spells and used to generate power. Now, with aridification depriving the river of those excess flows, both functions are imperiled. In April, Lake Powell fell perilously close to the point at which dam operators would have to stop sending water through the turbines, depriving the grid of enough electricity to power about a quarter of a million homes annually. It would also drain between $100 million and $200 million annually from dam electricity sales, some of which helps fund endangered species recovery, salinity control and water studies on the Colorado River. Officials have released extra water from upstream dams and are currently letting less of it flow through Glen Canyon Dam, raising water levels just enough to keep the turbines spinning. —Jonathan Thompson

The water level at Lake Powell continues to drop and could soon threaten the electricity-generating turbines of Glen Canyon Dam, seen in the distance. Luna Anna Archey/High Country News
See inside Glen Canyon Dam as Lake Powell levels drop
Gus Levy, plant facility manager, walks past hydropower turbines. Due to the low water level, only five of the eight turbines operate on a daily basis, though all eight must be kept in working order. Luna Anna Archey/High Country News
See inside Glen Canyon Dam as Lake Powell levels drop
As the power plant uses such large quantities of oil, used, dirty oil is cleaned and reused. The oil can be repurposed for decades (left). Adrian Kelly, a power plant mechanic, stands for a portrait after welding a water pipe that will be used to cool the dam’s new power transformers (right). Luna Anna Archey/High Country News
See inside Glen Canyon Dam as Lake Powell levels drop
Pieces of a permanent magnet generator from one of the turbines. Luna Anna Archey/High Country News
See inside Glen Canyon Dam as Lake Powell levels drop
Electrician Ray Dugi bikes into the dam’s machine shop; employees use bike toolboxes to get around the huge power plant. Dugi has worked at the dam for 25 years. Luna Anna Archey/High Country News
See inside Glen Canyon Dam as Lake Powell levels drop
Retro gauges from when Glen Canyon Dam first was constructed (right). Inner workings of the dam (left). Luna Anna Archey/High Country News
See inside Glen Canyon Dam as Lake Powell levels drop
Glen Canyon DamÕs intake points for the water to power the plant’s eight turbines will be above the water line–the minimum power pool–if the lake level drops another 33 feet. If that happens, the plant will not be able to generate power, though it would need to be maintained in case the water level rises in the future. Luna Anna Archey/High Country News




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