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Study Finds 'Hidden Cost' of WA Lower Snake River Dams by Eric Tegethoff Public News Service, January 22, 2025

Dams on the lower Snake River in Washington state are losing water to evaporation at a rapid rate, according to a new study. The reservoirs created by the four lower Snake River dams lose more than 30,000 acre feet of water each year. That's enough water for the household needs of 240,000 people, the Stockholm Environment Institute estimates.

Miles Johnson, legal director of Columbia Riverkeeper, said this is another drawback of the dams.

"This study showed that there is a hidden cost to the existence of the lower Snake River dams, and that's not to take away from any of the other well understood costs of the lower Snake River dams, which are the compromise of tribal treaty rights, impeding salmon recovery," he said.

The reservoirs from the dams have a surface area of about 30,000 acres in total. Columbia Riverkeeper and other organizations are calling for the dams to be removed to ensure the recovery of endangered species like salmon, which also impacts tribal nations. Critics argue that dams are often taken down without the input of nearby communities.

Groups opposed to removing the dams point out that they're important for irrigating farmland in the region. However, Johnson says this hurdle can be overcome.

"We can have those things alongside the services that the lower Snake River dams currently provide if we plan carefully and invest wisely in replacing those services," Johnson explained.

The study also found that the water that's lost to evaporation from the reservoirs each year could grow more than 8,000 acres of apples, or generate $3.7 million in revenue for farms in southeast Washington.

Related Sites:
Water lost to evaporation from lower Snake River reservoirs by Stockholm Environment Institute, January 2025