The Colorado River basin has been here before.
This year’s historic winter of low snow might feel novel. But recent years give some insight into just how dry the West’s most important river system can get. This season’s scant snowpack is melting rapidly, and turning up memories of other notably dry years.
Prolonged drought conditions and warming temperatures since 2000 have produced severe single-year droughts in 2002, 2012, 2018 and 2020 in the river’s headwaters states of Colorado, Wyoming and Utah. As severe drought years continue to put the Southwest’s water infrastructure to the test, communities in the region are grappling with how best to understand and adapt to a changing climate.
2002 stands as the worst drought on record for the Colorado River, measured as the flow into one of its biggest reservoirs, Lake Powell on the Utah-Arizona border. It’s possible 2026 could break that record. Back then the year acted as a wake-up call to the region’s water leaders, spurred important policy changes, and reshaped attitudes around conservation.
We asked Colorado River experts Eric Kuhn, Jeff Lukas and Jim Lochhead to share five important takeaways from the 2002 drought, and what to know as we enter the warmer, drier months of 2026.
1. Reservoirs have memory
Reservoirs act as batteries for water availability, charged by inputs such as snowmelt, streams, rivers and precipitation.
“What you did two or three years ago can affect your water supply now,” said Eric Kuhn, former general manager for the Colorado River Water Conservation District. “So in a good year, if you are conserving, you are actually helping the system out for the next drought.”
The 2002 drought prompted municipal utilities to rethink their reservoir usage.
“Water managers and agencies have absorbed several lessons from 2002, including holding something back. They’re operating the reservoirs a little differently,” said Jeff Lukas, an independent climate and water researcher who has lived on Colorado’s Front Range for 40 years.
By conserving reservoir water, municipal utilities can maintain water storage for less abundant water years of the future. But as dry conditions have dogged the entire Colorado River basin for more than a quarter-century, the system’s buffer is gone.
“The biggest issue is that Lake Powell and Lake Mead were relatively full in 2002,” Kuhn said. Now, both Lake Powell and Lake Mead are at critically low levels, and the water scarcity is increasing the likelihood of multi-state litigation.
In 2002, drought was dealt with on a local level; water utilities were not thinking about drought in terms of the entire river system, but instead how to regulate municipal water use. This year’s dry conditions are pushing the whole region to the brink.
2. Conservation can make a big difference, if it is mandatory
Individual contributions to water conservation, adhering to local outdoor watering restrictions for example, can make a difference. Prompted by the 2002 drought, a 2004 University of Colorado study aimed to measure the effectiveness of water restrictions put in place by water providers on the state’s populated Front Range.
The study followed municipal water providers Thornton, Aurora, Westminster, Fort Collins, Boulder, Louisville, Lafayette and Denver Water, comparing 2002 usage to average water usage in 2000 and 2001. Researchers determined that water restrictions are most effective when mandatory. Mandatory restrictions in Lafayette reduced water usage by as much as 53%, according to the study.
The same study found that under mandatory restrictions, savings of expected water use per capita was as successful as 56%, while voluntary restrictions only measured up to 12%.
Outdoor watering represents a big slice of a city’s water budget, and 2002 showed utilities that in times of crisis people can rein in their use.
“Everyone should realize that they can make a small contribution to the solution,” Kuhn said. “Even though their individual contribution might be miniscule, when you add up all their neighbors and other people, it’s not miniscule. It’s very, very big.”
Watering a lawn once or twice a week, and not during peak hours, is a practical way to conserve water while keeping grass alive.
3. This is not a one-off year
It’s easy to shrug off a dry year and hope for wet weather’s return. But the long-term trends are concerning.
“This is really the 26th year of extreme drought,” said former Denver Water CEO Jim Lochhead. On a larger scale, the seven Colorado River basin states—Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming—have been preparing for worsening drought conditions since the shock of 2002. But river policy hasn’t kept pace with the aridification, leaving the region’s largest reservoirs at near record lows.
“This has been a slow moving train that I think the states have known was coming, and they have frankly failed to do anything about it,” said Lochhead, who also represented the state of Colorado amid interstate Colorado River negotiations in the 1990s and early 2000s.
The Colorado Climate Center anticipates droughts to increase in severity and frequency, a trend that is only expected to continue in Colorado and across the Southwest as warming temperatures upend the water cycle.
“We should be managing and thinking about water, using water, as though it were always a drought,” Lukas said.
4. Communities have more practice dealing with drought, but still struggle
Drought conditions in 2002 led some municipal water utilities to organize and create incentives for conservation, and transformed the urban landscape, swapping grass for more drought-tolerant plants. Those water restrictions allowed municipal water providers to curb water demand while steadily growing in size. However, there is still room for improvement in disproportionately affected communities.
According to Lochhead, urban areas need to prioritize heat reduction in neighborhoods that have fewer trees in order to lessen the impacts of drought and warming temperatures. Using scarce water supplies to encourage tree-planting and increase shade should remain a priority.
“I think we need to work with those communities to enhance some landscaping,” Lochhead said. “Whether it’s the homeless population, whether it’s just kids that are out, whatever it may be, those areas are where they’re pretty hard hit by heat.”
Farmers and ranchers are used to riding the highs and lows of western weather. But extremely dry years like 2002, and now 2026, can push their operations to the limits.
“This is going to be a really tough year,” Lukas said. “You’re going to have a lot of people selling off their herds and taking insurance out because of low crop yields.”
The majority of Colorado’s annual water supply is used for irrigation, so any proposed restrictions can be costly for the agricultural community. “There are going to be a lot of farms and ranches that just can’t operate because they don’t have any water,” Lochhead said. “There are going to be some significant economic consequences.”
5. Stay aware, even if things seem bleak
For Lukas, this year and its predecessors test our expectations about what nature can provide.
Even in periods of prolonged drought, there are wet years. “Judging from history, that tends to put everyone back on their heels, a little complacent,” Lukas said, but maintaining water storage relies on year-to-year vigilance, not complacency.
Another primary concern during drought years is wildfire. With less moisture in the soil, dry vegetation acts as fuel for wildfire, which becomes harder to contain under hot and dry conditions.
“I worry a lot less about municipal water supply than I do about wildfire,” Lukas said. Many of Colorado’s notably dry years have also recorded severe and destructive wildfires.
It comes at no surprise that worsening drought falls in line with worsening wildfires. “Climate change is delivered to people through changes in the hydrologic cycle,” Kuhn said, so being aware of water usage now is just as, if not more important as it was in 2002.
This story was produced and distributed by The Water Desk at the University of Colorado Boulder’s Center for Environmental Journalism.