Confronting Colorado River challenges

Denver Water is joining other utilities and districts to address water shortages on the lifeblood for the southwest.

February 12, 2019 | By: Todd Hartman
Water sprays from the base of Glen Canyon Dam into the Colorado River
Water released from Lake Powell during flow experiments on the Grand Canyon in 2016. Photo credit: U.S. Bureau of Reclamation.

 

Climate change, drought and overuse are taking a heavy toll on the Colorado River and those who depend upon it.

Declining runoff and sinking reservoir levels have sparked widely-documented concern on the Colorado, leaving utilities and districts in seven states — including Denver Water — planning ways to avoid shortfalls on the river that could threaten water supplies from the Front Range to Southern California.

These plans, called drought contingency plans, require states in the upper and lower basins of the Colorado River to map out ways to ensure enough water remains in two mammoth reservoirs that are key to managing water supplies in the river basin. Ultimately, the states want to manage the river so that it can continue to support their growing populations, agricultural economies and the environment.

One of several outstanding elements was resolved on Jan. 31, when Arizona’s state legislature approved the DCPs just ahead of a midnight deadline set by the federal Bureau of Reclamation for the Colorado River basin states to complete the plans.

“This is an important moment for Denver Water, for Colorado and for all of the seven states and country of Mexico that depend upon the Colorado River,” said Jim Lochhead, Denver Water’s CEO/Manager. “These plans required states to make difficult decisions that may lead to temporary reductions in how much water we take from the river. But these plans are critical to avoiding crisis and ensuring secure supplies in this era of shortage.”

Denver Water gets half of its supply from the Colorado River Basin, so the utility and the 1.4 million people it serves in metro Denver are directly affected by the changing conditions — both natural and political — in the basin.

“This is a huge challenge for us,” said David Bennett, director of water resource strategy for Denver Water. “For so long these issues on the river seemed more distant. But as the long-term drought within the Colorado River Basin continues, it’s now become one of the biggest challenges we’ve ever faced.”

Lake Mead near Las Vegas showed signs of dropping elevation even earlier in the decade. The “bathtub ring” in the reservoir has expanded since this photo was taken several years ago. Photo credit: U.S. Bureau of Reclamation.

 

Many factors are at play on the Colorado, but the primary driver to a shortage in the Colorado River Basin is hydrological. Less water is coming into the system than in decades past. A drought — what many warn may really be a long-term shift — has seen below-average flows into Lake Powell in 15 of the last 19 years.

Powell, a massive reservoir that collects runoff from the upper basin states of Colorado, Wyoming, New Mexico and Utah, is dropping. Upstream of the Grand Canyon, Powell releases water to the lower basin states of California, Nevada and Arizona. That water is captured and stored in Lake Mead, which is also seeing levels fall.

Lake Mead’s shortfalls can be attributed to overuse. In effect, more water has been withdrawn from Mead than the basin has produced. That overuse, combined with drier conditions, has sent reservoir levels dropping to record low levels.

Keeping both Powell and Mead at higher elevations not only protects water users in drier periods but also assures hydroelectricity production, the revenues from which fund an array of water management activities on the river, including operation of other federal reservoirs upstream and endangered species protections.

“Every year the lower basin states overuse (their allocation) they keep the entire basin in crisis,” Andy Mueller, the general manager of the Colorado River District, told the Colorado Water Congress at its annual convention in Westminster this month.

For its part, Lochhead said, the upper basin also must ensure it meets its legal obligations to the lower basin, regardless of the water management problems in the lower basin states.

Colorado and its three neighboring states must send an average of 7.5 million acre-feet of water to Lake Powell every year. Should, over time, the upper basin fail to meet that average, the lower basin states can “call” for more water — a scenario that could create a chaotic scramble to find water to send downstream and one the drought contingency plans are designed to prevent.

The drought contingency plans produced by the upper and lower basins take steps designed to reduce pressure on Powell and Mead. These steps include:

  • The lower basin DCP that provides for “shortage-sharing,” where California, Nevada and Arizona will take less water from Lake Mead to help reservoir levels rebound and protect hydropower production.
  • The upper basin DCP consists of:
    • Continued cloud seeding operations.
    • A reservoir operations agreement that provides for releases from major reservoirs upstream from Powell (Flaming Gorge in Wyoming/Utah, Navajo in New Mexico/Colorado and Blue Mesa in Colorado) to prop up Lake Powell as needed.
    • A demand management agreement that would create a 500,000 acre-foot “storage pool” within Lake Powell from water conservation efforts in Colorado, Utah, New Mexico and Wyoming.
Panoramic view of Hoover Dam. The dam holds back Lake Mead, one of the reservoirs key to drought contingency planning. Photo credit: U.S. Bureau of Reclamation.

 

A major goal of the upper basin DCP is to maintain water levels in Lake Powell above an elevation at which power can still be produced. Water stored in Powell under the demand management agreement will be protected from release unless needed for an emergency “call” of water to the lower basin states.

Creation of the storage pool will be a major undertaking for Denver Water and other Colorado River water users. It will require significant planning and negotiation to determine both how water users will generate the needed water to fill the pool and how to ensure that conserved water makes its way through the river system to Powell. The Colorado Water Conservation Board, a state planning agency, will be a key leader in such discussions.

At the Colorado Water Congress meeting this month, both Lochhead and Mueller pledged to do their part in working with the CWCB, forging ahead cooperatively and providing leadership to the state’s water community.

“We need to roll up our sleeves and get after it,” Lochhead said. “As I’ve indicated many times, we’re prepared to contribute our share of water into the solution. We’re going to have to work together as a state for our mutual benefit and survival in the upper basin.”

7 thoughts on “Confronting Colorado River challenges”

  1. IT SOUNDS LIKE MORE RHETORIC, STILL THROWING TWIGS AT A CHARGING BULL, STOP CRISIS MANAGEMENT BE PROACTIVE, BUILD MORE RESERVOIRS. DAMN THE TORPEDOES , FULL SPEED AHEAD. WE NEED MORE PEOPLE LIKE HENRY J. KAISER, GORDON KAUFMANN AND FRANCIS TRENHOLM CROWE. YES, TWO FORKS RESERVOIR WILL BE A GOOD START, START TO BUILD IT NOW AND 50 YEARS FROM NOW OUR DESCENDANTS WILL THANK TODAY’S VISIONARIES .

  2. Time to actually “roll up your sleeves” and stop talking about it.

    In addition, living in the Denver Metro Area, it is painfully evident that we need to further enforce prudent use of water. We waste a lot of water!

  3. Thank you for keeping us informed. I find this topic fascinating and have been following your updates. I would love more information on the contingency plans in place and how they will potentially operate and what events will trigger them.

    1. Thanks for your interest Tina. We will continue to follow the drought contingency planning process and how it unfolds in Colorado and throughout the Colorado River Basin.

  4. One of Denver Water’s (DW) answers to this problem is to divert more water from the already depleted Colorado River by further draining the Fraser River (to virtually nothing). In the process, they seek to raise Gross Reservoir by 131 feet, without any hard evidence that there will be enough water to fill the dam or the gigantic hole that would be created. Meanwhile, climate scientists from CSU forecast that the Colorado River flows will continue to decline. When approximately half of Gross’ water is used to water lawns in Denver each summer, the time to reevaluate our relationship with water usage has arrived. Also, even as Denver’s population has grown by 10%, water usage in the city went down 20%, so the DW nutshell argument that water “needs” are increasing holds no water.

    1. Thanks for reading and for your comments Ben. You raise important issues, and more information about them can be found at our Gross Reservoir website. It includes information about environmental impacts and mitigation as well as answers to many FAQs about the expansion project.

  5. Although not an immediate answer, in 10-20 years once nuclear fusion power plants can be built to supply electricity to reverse osmosis desalination plants, maybe California can reduce in’s draw on the Colorado enough to restore Lake Mead. Unfortunately that would probably mean producing 2-5 million acre feet since only some of the additional water would be offset by reduced draws on the Colorado.

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