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The 100-Year-Old Math Miscalculation That Broke the Colorado River
The Wall Street Journal ^ | Oct. 9, 2026 12:02 pm ET | Michael Tabb

Posted on 10/09/2026 11:05:00 AM PDT by E. Pluribus Unum

About 40 million people rely on the Colorado River. But an extended drought and a century-old legal framework have pushed the system to a breaking point. Now, a federal plan threatening deep cuts has ignited a political and legal war across the Southwest.

Watch Arizona State University water law professor Rhett Larson break down where the government’s framework falls short, why easy fixes won’t solve the issue, and what structural overhauls are needed to protect a crucial regional economy.

(Excerpt) Read more at wsj.com ...


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KEYWORDS: coloradoriver
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Video Transcript Summary

Summary: The 100-Year-Old Math Miscalculation That Broke the Colorado River

The Wall Street Journal examines how a century-old error in estimating the Colorado River’s water supply helped create today’s water crisis, threatening the water security of roughly 40 million people across the American West and Mexico.

1. The original mistake: Overestimating the river’s supply

In 1922, seven U.S. states negotiated the Colorado River Compact, dividing the river’s water between two regions:

A 1944 treaty also allocated 1.5 million acre-feet annually to Mexico.

The fundamental problem was that negotiators based their allocations on unusually wet years, when the river carried historically high volumes of water. They committed more water than the river could reliably supply.

According to water law professor Rhett Larson of Arizona State University, the river’s long-term average flow is closer to 13.5 million acre-feet annually , rather than the 15 million allocated to the two U.S. basins alone. Climate change and increasing aridification could reduce available supplies further, potentially toward 10 million acre-feet annually.

2. The federal government's proposed solution could intensify the conflict

After years of failed negotiations among the states, the federal government proposed a new framework for managing the river over the next decade.

The proposal could impose anything from no cuts to the Lower Basin to reductions of as much as 3 million acre-feet annually.

The central controversy is that the proposal does not require corresponding reductions from the Upper Basin. This creates an imbalance: the Lower Basin faces potentially devastating cuts, while the Upper Basin has less incentive to agree to a compromise.

Nevada has already filed a lawsuit challenging the proposed approach, and further litigation is expected. The resulting legal battles could delay a lasting agreement while water supplies continue to deteriorate.

If another below-average winter occurs, reservoir levels could fall toward critical thresholds. At power pool , dams can no longer generate electricity normally; at dead pool , water can no longer flow downstream through a dam.

3. Alternative water supplies are possible, but expensive

The documentary examines several ways to supplement the river's shrinking supply.

Larson's central economic observation is that the United States is not necessarily running out of water in an absolute sense. It is running out of cheap, accessible water . Obtaining, transporting and treating water from alternative sources will become increasingly expensive, putting upward pressure on water bills.

4. Agriculture is the biggest target for conservation

The documentary identifies irrigated agriculture as the dominant consumer of Colorado River water, accounting for approximately 75% of the water used when evaporation and other natural losses are excluded from the accounting.

Municipal and industrial users account for much of the remainder.

Consequently, reducing agricultural consumption could free up substantially more water than focusing primarily on highly publicized industrial users such as data centers.

One proposed approach is to retire especially water-intensive crops, including alfalfa and hay. However, this would impose serious costs on agricultural communities, potentially reducing farm income, employment and local tax revenue. Consumers could also face higher grocery prices.

The documentary argues that federal assistance would be essential to make such transitions economically viable, including conservation grants, rebates, loans and investment in additional water supplies.

5. Australia offers a possible model for reform

The documentary highlights Australia's experience managing the Murray-Darling Basin during its early-2000s drought.

Australia shifted toward a system in which water users held shares of the available supply, with those shares tradable in a market. Such a system can adjust allocations to the amount of water actually available rather than relying solely on fixed quantities established under older agreements.

A comparable system could help the Colorado River states adapt to changing water supplies.

However, the approach carries risks. Investors could buy up water rights and hoard them or speculate on scarcity. Any water market would therefore require safeguards to prevent manipulation and protect essential users.

6. Arizona faces particularly serious consequences

The Central Arizona Project (CAP) operates a 336-mile canal supplying water to more than 6 million people. It has been essential to Arizona's growth and economy.

Because CAP water has a relatively junior priority under the existing allocation system, it is especially vulnerable to substantial cuts. Arizona has already made both mandatory and voluntary reductions and closely monitors snowpack, reservoirs and incoming water supplies.

Further reductions could threaten communities and industries that depend on the canal. Although Arizona has diversified its water sources, officials warn that this cannot indefinitely compensate for major, sustained losses of Colorado River water.

Main takeaway

The Colorado River crisis stems from a fundamental mismatch between the water promised under a century-old allocation system and the amount the river can reliably provide today. Climate change and prolonged drought are making that mismatch worse.

The documentary's proposed path forward involves several difficult choices: renegotiating allocations, reducing agricultural water consumption, investing in alternative supplies, providing federal financial assistance and potentially creating a regulated market for water rights.

There is no cost-free solution. Preserving the river system will require deciding who receives less water, who pays for conservation and infrastructure, and how the economic consequences are shared. Without a negotiated agreement, the combination of dwindling supplies, legal disputes and declining reservoir levels could turn an existing shortage into a much broader regional crisis.

1 posted on 10/09/2026 11:05:00 AM PDT by E. Pluribus Unum
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To: E. Pluribus Unum

bfl


2 posted on 10/09/2026 11:10:45 AM PDT by Attention Surplus Disorder (q)
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To: E. Pluribus Unum

Climate change and prolonged drought are making that mismatch worse.“

Well the so called Climate change is a bunch of BS so there is that


3 posted on 10/09/2026 11:11:21 AM PDT by gibsonguy
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To: E. Pluribus Unum

How many millions of illegal immigrants are using up water in the dry area of the Colorado River basin? That’s clearly part of the math.


4 posted on 10/09/2026 11:11:21 AM PDT by Tell It Right (1 Thessalonians 5:21 -- Put everything to the test, hold fast to that which is true.)
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To: gibsonguy

They even said earlier in the documentary that the mistake was using the water volume from an unusually high year.


5 posted on 10/09/2026 11:13:59 AM PDT by E. Pluribus Unum (The right of the Democrats to embezzle elections shall not be infringed. )
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To: gibsonguy
Well the so called Climate change is a bunch of BS so there is that

No mention of the fact that human populations using the water, exploded in number over the last century. Not to mention increased use of agricultural and industrial use by increased numbers of humans. The Climate change argument takes a back seat to the other lies.

6 posted on 10/09/2026 11:17:04 AM PDT by roadcat ( )
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To: E. Pluribus Unum

So, like many times in the last 175 years, faulty thinking by supposed expert GOVERNMENT PLANNERS I so flawed as to create disasters they were meant of totally avoid.


7 posted on 10/09/2026 11:18:36 AM PDT by KC Burke
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To: E. Pluribus Unum
Water recycling: Advanced purification can make wastewater potable, but treatment costs and public resistance remain obstacles.

Millions of tons of wastewater is treated and dumped into oceans and rivers. Sewage wastewater from millions of humans should be recaptured via purification. Billions of dollars are spent on redirecting water over thousands of miles, so money really is not the issue. It is how it is managed.

8 posted on 10/09/2026 11:25:12 AM PDT by roadcat ( )
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To: E. Pluribus Unum

Good video. Thanks for posting.

One thing the professor said is that the Upper Colorado River Basin does not use all of its allocated water. Then, logically, that water flows south. Does law require it flow to Mexico and the Gulf of California untouched? He did not explain what happens to their allocated share that they do not use today.


9 posted on 10/09/2026 11:25:46 AM PDT by ProtectOurFreedom
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To: gibsonguy

“Well the so called Climate change is a bunch of BS so there is that”

Uh the climate in the South West does change on a multi decade and century scale cycles with droughts and mega droughts lasting for upwards of a century. The tree rings and paleoflow and sedimentary deposits all confirm this. The El Nino cycles drastically affect it as does the solar magnetic cycle , sun spot cycle and the earth’s orbital precession and axis tilt plus elliptical orbit distances too.

This current cycle is dry much drier than the 1920d when the compact was made and if the history pattern is right we have half a century more of 11-10 million AF per year vs 14-15. Humans in suvs didn’t cause it but from a real water numbers and use that’s irrelevant what is relevant is there is and will be less water coming down on avg for a generation longer maybe 2 again if we repeated the last pattern.

So the talk needs to be how do you get by on less water that’s just fact.


10 posted on 10/09/2026 11:43:30 AM PDT by GenXPolymath
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To: gibsonguy

Climate change is real the cause of it is not man


11 posted on 10/09/2026 11:44:05 AM PDT by al baby (Sarcasm )
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To: E. Pluribus Unum
They planted lawns in Las Vegas for decades and didn't start restricting watering until 2021, including financial incentives for homeowners to tear them out, and restrictions on new planting.

Lawns... Las Vegas

12 posted on 10/09/2026 11:47:40 AM PDT by T.B. Yoits
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To: Tell It Right

All urban use by residential, industrial and commercial is only 25% of total basin water use. Residential is half of that so 12.5% figure 4:1 legals to illegals so 3 ish percent almost a rounding error even being generous with the 25% of every person in the Colorado basin that’s 10 million illegals alone.

Agriculture is the issue, specifically growing crops like alfalfa that demand FIVE FEET of water per square-foot of land area per year. Clearly that is not sustainable.

We have plenty of rain east of 100W to grow grass for cows with.


13 posted on 10/09/2026 11:50:57 AM PDT by GenXPolymath
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To: T.B. Yoits

Sigh

All of Nevada gets 300,000AF of water and they use less than their total amount every year and recycle 98% of every drop that hits a drain in the Vegas basin.

California takes 4.4 million acre feet and 80% of that goes to grow grass for cows in the desert or almonds for soyboy milk.

AZ takes 3.9 million

Tell the class again how 300k is the problem when they don’t even take it all.


14 posted on 10/09/2026 11:54:11 AM PDT by GenXPolymath
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To: E. Pluribus Unum

The problem is not a math miscalculation, but false assumptions about the nature of reality.

The original estimators assumed the flow of the river would not change. In the 1920’s, there was far less use of the river, so it likely seemed not to make a difference.

In our rapidly changing world, it is an easy mistake to make.

It lasted over 100 years. All the people involved are dead.


15 posted on 10/09/2026 11:54:17 AM PDT by marktwain (----------------------)
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To: roadcat
Millions of tons of wastewater is treated and dumped into oceans and rivers. Sewage wastewater from millions of humans should be recaptured via purification. Billions of dollars are spent on redirecting water over thousands of miles, so money really is not the issue. It is how it is managed.


16 posted on 10/09/2026 11:55:45 AM PDT by E. Pluribus Unum (The right of the Democrats to embezzle elections shall not be infringed. )
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To: GenXPolymath
...less than their total amount...

That's the crux of the problem. The negotiated totals were unfeasible from the beginning.

They're all guilty. I just pointed out that water for lawns in a desert is an extreme use of water.

17 posted on 10/09/2026 11:57:08 AM PDT by T.B. Yoits
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To: T.B. Yoits
Yeah it's Vegas lawns.



18 posted on 10/09/2026 11:59:51 AM PDT by GenXPolymath
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To: marktwain
Problem is people wanting to grow grass for cows east of this line. Alfalfa is the biggest water hog in the West and it uses FIVE acre feet per year in AZ or CA climates. CA alone uses 4 million acre feet just for alfalfa clear they must stop.

19 posted on 10/09/2026 12:05:00 PM PDT by GenXPolymath
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To: GenXPolymath

The Australian solution seems a reasonable way to allocate the water. It does not assume an absolute supply number, and allows trading so water can go to the highest/best use through market forces.

The United States government, the states involved, and Mexico all have to be involved in the negotiations.


20 posted on 10/09/2026 12:17:20 PM PDT by marktwain (----------------------)
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