Bureau of Reclamation completes project at #GlenCanyonDam to protect local #water supply during extremely low lake levels #ColoradoRiver #COriver #aridification

Mechanic apprentice Joseph Sams grinds a coupling that is part of the new lower water intake for the city of Page. Reclamation crews at Glen Canyon Dam constructed the new intake as a precaution as Lake Powell’s elevation is at historically low levels.

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Reclamation crews at Glen Canyon Dam recently completed a new water intake connection to accommodate the low water levels at Lake Powell. These efforts ensure water will be delivered to the city of Page, Arizona, and the LeChee Chapter of the Navajo Nation even if Lake Powell drops to 3,370 feet. Elevation 3,370 feet is known as “dead pool” and is the point at which no “excess” water can be passed through the dam, only the volume of water that enters the reservoir will be able to be delivered downstream.

Lake Powell’s elevation is expected to drop to a post-filled, all-time low (below 3,522.24) before the end of the month and projections show that this year it is at risk of dropping below minimum power pool (elevation 3,490 feet), which is the lowest point the dam can currently generate hydropower. The increased risk to Lake Powell’s water level also raised concern about the stability of the local water supply.

A valve for the new lower intake hangs above the work area below Glen Canyon Dam Bridge as crews prepare to put the valve into place.

The city of Page was first established in 1957 for workers who were constructing Glen Canyon Dam.& In 1975, Page became a municipality, which prompted an agreement with Reclamation to deliver raw water from Lake Powell to their municipal water system, which now delivers treated water to the area’s 7,500 residents, the Navajo Nation community of LeChee, and the local businesses that serve an estimated 3 million tourists each year.

Reclamation personnel Damion Thomas (left) and Randolph Sloan (right) prepare to lower a valve down into what is referred to as a vault, where the valve will tap into two bypass tubes to construct a lower water supply for the nearby communities.

With the completion of this project, the water delivery system can now draw water from Lake Powell at three different elevations: (1) the main intake at a reservoir elevation of 3,480 feet, (2) the backup which taps into two penstocks and can access water at elevation 3,462 feet, and (3) the latest and lowest intake which taps into two bypass tubes (also referred to as river outlet works) and can access water as low as elevation 3,362 feet.

The new intake taps into two bypass tubes and then connects to the waterline leading to the municipal water treatment system.

“Working with personnel from the city of Page and the LeChee Chapter, we started looking for solutions,” said Reclamation Upper Colorado Basin Region Deputy Power Manager Bob Martin. “Our engineers and mechanical crews explored a number of possible options, and we came up with a relatively easy solution to a potentially large problem for the people who rely on this water source.”

This latest intake was made possible through an extension of the original water agreement with the city of Page. Crews at Glen Canyon Dam started construction in October and completed the project in December of 2022. The city provided the supplies and paid for the labor.

Glen Canyon Dam has four bypass tubes, also referred to as river outlet works (ROWs) that can draw water from Lake Powell around elevation 3,370 feet, bypassing the powerplant and sending the water downstream. To send water from the new intake to the city of Page, the bypass tube’s valve is closed, allowing the pipe to fill with water, creating enough head pressure to send the water through the connected piping leading to Page’s water treatment facility.

“The design and construction of this project is proof of Reclamation’s commitment to addressing prolonged drought and critically low reservoir levels,” said UCB Regional Director Wayne Pullan. “We face the impacts of aridification together. The lower water intake at Glen Canyon Dam provides additional water security—the promise of a continued dependable and reliable water supply.”

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