Amazon Web Services is confirmed as the developer behind a planned data center campus at the Port of Walla Walla. It would be the company’s first data center in Washington.
County documents show the Amazon Attalia Data Center Campus would cover 134 acres between Sundance Road, Dodd Road and Worden Road. The plans include:
Three buildings of 220,000 square feet each
300MW of expected power capacity
A security building and an industrial water facility
A substation pad for a future utility provider to complete
Room to Spare: The site is part of 554 acres in the Wallula Gap Business Park sold to Amazon Data Services in February 2026. That means the campus uses only about a quarter of the land.
Shrink Wrapped: The project is also a significant scaling back from what was previously planned for the site. In October 2024, Advance Phase LLC bought about 500 acres in the park for $32.5 million.
At the time, the site was planned to be home to a $4.8 billion campus of 16 buildings totaling more than 3.4 million square feet. AWS’s three buildings come to 660,000 square feet, less than a fifth of that floor space.
Tough Room: Only 23 of 706 submissions, about 3%, backed the project during a public comment period that closed in the middle of October. Even those in favor recommended controls, including protecting “the ecology of the Walla Walla Valley.”
Calls have also been made for a full Environmental Impact Statement before the project gets final approval.
Not Done Yet: The county and Facet, an outside planning consultant, are working on a State Environmental Policy Act review. After it’s done, AWS can review the issues raised, and a second comment period will open.
The county will make a formal decision only after that, and no timeline has been set.
The plan has shrunk from 16 buildings to three, but Walla Walla still gets another say before the county decides.
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