The Umatilla Chemical Depot will cease destroying chemical weapons in November, resulting in a loss of danger but also a loss of 650 jobs.
The depot has been destroying weapons like mustard gas as part of a nationwide effort to fulfill treaty obligations.
"This is going to be a really big hit to the community," Bruce Sorte, an Oregon State University community economist, said at a forum in Hermiston.
He said the annual loss will be as much as $50 million, including ripple effects.
The move will hurt business and mean the population of the area will remain flat for half a decade, Sorte said.
Read more at KVAL.com.