Amazon Web Services has been confirmed as the developer behind a data center campus at the Port of Walla Walla in Washington state, and has revealed details of the project, according to Data Center Dynamics. The site is described as the cloud provider’s first data center in the state.
Documents shared by Walla Walla County show that the Amazon Attalia Data Center Campus will include three data center buildings of 220,000 square feet each on 134 acres between Sundance Road, Dodd Road and Worden Road. The campus is expected to have 300 MW of power capacity. AWS will also build a security building, an industrial water facility and a pad for a substation that a future utility provider will complete.
The property is part of the 554 acres in the Wallula Gap Business Park that were sold to Amazon Data Services in February 2026. The park is a 1,900-acre heavy industrial site next to US Highway 12 and a Union Pacific mainline, ten miles from Interstate 395. Walla Walla is in the southeast of Washington state, around a four-hour drive from Portland, Oregon, where AWS already operates a cloud region.
The current plan is a more focused version of what was first proposed for the area. In October 2024, Advance Phase LLC bought about 500 acres in the Wallula Gap Business Park for $32.5 million for a data center campus, and the end user company behind the project was not named at the time. That earlier proposal described a $4.8 billion campus of 16 buildings, built in four phases of 125 acres each, with four buildings of about 215,000 square feet in every phase, for a total of more than 3.4 million square feet.
The review process continues. Walla Walla County and the planning consultant Facet are carrying out a State Environmental Policy Act review. When it is complete, AWS will be able to review the issues raised, and a second public comment period will open before the county makes its formal decision. No timeline has been set, so details on construction timing are still to come.
County records show how the application has moved. A pre-application meeting took place on April 29, 2026, and the county issued a notice of incomplete application on June 23 for the site development permit and the related environmental review. AWS then held an open house on August 11, from 4 to 8 p.m., and Amazon provided a frequently asked questions document to residents on August 10. The county issued a notice of complete application on August 24 and a notice of application on September 12, which opened the public comment period that preceded the current review.
Those steps show a conventional sequence for a project of this size: early meetings with planners, a round of corrections to make the file complete, direct outreach to neighbors, and then formal notices that let the public respond. The open house and the FAQ gave residents a chance to ask about water, power and traffic before the comment period began, and the county has also posted an Amazon community commitment announcement on its project page.
For the region, a named developer changes the conversation. Port of Walla Walla officials, county planners and neighbors can now evaluate a specific design with defined building sizes and an industrial water facility, instead of reacting to an anonymous proposal. For Amazon, the project would give its Pacific Northwest customers a first campus inside Washington, a state where the company is already a major employer.
With a named developer, defined building sizes and a 300 MW target, the project gives the region a clearer picture of the scale of cloud infrastructure planned for southeast Washington. Further details on power sourcing and cooling are expected as the environmental review moves forward and AWS responds to the issues raised during the process.
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