As Lake Powell levels drop, see inside Glen Canyon Dam

The hydropower plant that powers about a quarter of a million homes is run by a team of mechanics, electricians and more.

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.

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.
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). At left, oil supplies and transport pipes.


  • Arlo Ketchum, a power plant electrician, works on the PMG (permanent magnet generator) from one of the turbines. The PMG is the “brain” of the machine, communicating with the other turbine components. Much of the plant’s technology is unchanged since it was built in 1964, so replacement parts can be hard to find and must often be refurbished or replicated by staff.

  • Pieces of a permanent magnet generator from one of the turbines.

  • 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.

  • Glen Canyon workers are reflected in the windows surrounding the hydropower turbines.

Retro gauges from when Glen Canyon Dam first was constructed (right). Inner workings of the dam (left).

Glen Canyon Dam’s 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 is HCN’s associate photo editor. She lives in Paonia, Colorado. 

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