Vail Resorts’ cancellation of cloud seeding this winter could mean less water in streams |

Vail Resorts’ cancellation of cloud seeding this winter could mean less water in streams

Heather Sackett
Aspen Journalism

ASPEN — Due to budget shortfalls, Vail Resorts has pulled this winter’s funding for its cloud seeding program — the longest-running in the state at 44 years — potentially reducing the amount of water flowing down the Colorado River this spring.

According to a November report from Colorado Water Conservation Board Director Rebecca Mitchell, due to economic challenges associated with the COVID-19 pandemic, Vail Resorts was forced to suspend all funding for cloud seeding for the 2020-21 season. This has resulted in a $300,000 loss of funding for cloud seeding activities over the central Rocky Mountains.

While this could be bad news for skiers, it also means a challenge for Western water managers who use cloud seeding to increase water supplies by increasing snowfall in the mountainous headwaters of the Colorado River and its tributaries. While ski resorts tend to focus their cloud seeding on increasing early-season snow, water managers tend to choose the best storms throughout the season and boost those.

According to Mitchell’s report, the loss of Vail’s cloud seeding program severely reduces the ability to augment and increase water supplies.

“This recent decision has put managers of the (Central Colorado Mountain River Basin Program) in a very difficult position as they endeavor to meet the needs of drought recovery,” Mitchell’s report reads.

Vail Resorts did not respond to requests for comment.

The weather modification program is one of six in Colorado. This program is run by the Colorado River Water Conservation District and covers Grand, Summit, Eagle and Pitkin counties. Vail Resorts’ program is separate from the central Colorado program, but it is within the permit area and focuses on Vail and Beaver Creek ski resorts.

‘A significant loss’

Cloud seeding uses a network of ground-based generators throughout the permit area to disperse silver iodide particles into clouds, where ice crystals form on them and fall to the ground as snow. Colorado ski areas and water managers on the Western Slope and Front Range have been using cloud seeding for decades to enhance snowpack and streamflows. The cloud seed generators in the central Colorado area are operated by Durango-based Western Weather Consultants.

Water managers see cloud seeding as an important tool for increasing water supply in times of drought. A study released earlier this year proved that cloud seeding can boost snowfall across a wide area under the right conditions. Weather modification programs were one of the elements included in the Drought Contingency Plan, signed by the Colorado River basin states in 2018.

“It’s one of the few ways to physically increase water supplies,” said Dave Kanzer, deputy chief engineer for the Colorado River Water Conservation District. “This is one of the legs of the stool. When we are looking at supply and demand, this is the supply side.”

Kanzer said a statistical comparison over 15 years shows a 2% to 5% annual increase in snowfall in basins that use cloud seeding over those that don’t. Although it’s difficult to determine the exact amount of extra snow that cloud seeding generates, it could equal up to 80,000 acre-feet of water within the central Colorado permit area, Kanzer said.

Since Vail’s program represents about half of this, one could expect any snow and water generated to also decrease by half this year.

“We have lost about half of our effectiveness,” Kanzer said. “It’s a significant loss to cloud seeding within our permit area.”

The central Colorado program has an annual budget of about $220,000 to $250,000, Kanzer said, with contributions from the River District, the Colorado Water Conservation Board, the Front Range Water Council and districts in the lower basin that supply water.

Colorado Water Conservation Board officials say they are still trying to find replacement funding and have been talking with Front Range water providers, including Denver Water. Spokesperson Todd Hartman said Denver Water currently provides $12,400 as part of the Front Range Water Council’s $70,000 contribution.

Cloud seeding uses ground-based generators to disperse dust-sized silver iodide particles into clouds so that ice crystals can form on those particles and fall to the ground in the form of snow.
Photo by Joshua Aikins

“The (Front Range Water Council) and Denver Water are aware of the reduction from Vail, and members are discussing how and whether to address that,” Hartman wrote in an email.

Three water providers in the lower basin states — Central Arizona Water Conservation District, Southern Nevada Water Authority and the Metropolitan Water District of Southern California — contributed $438,000 this year to cloud seeding programs across the upper basin, which also includes Wyoming, Utah and New Mexico.

Colorado Water Conservation Board Weather Modification Program Manager Andrew Rickert said it’s still too early in the season to know how Vail’s move might affect snowpack and streamflows.

“We just have no idea what kind of season we could have in front of us,” Rickert said. “We could have storms that are efficient enough not to need cloud seeding. It’s really just up in the air as to how this is going to affect water supplies for next year.”

Aspen Journalism is a nonprofit, investigative news organization covering water and rivers in collaboration with the Summit Daily News and other Swift Communications newspapers. For more, go to



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