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Located in south-central Washington, the Hanford Engineer Works, was built as part of the Manhattan Project, to provide the plutonium necessary for the development of the atomic bomb. Initial three reactors were constructed to produce the plutonium, along with plutonium processing facilities. During the Cold War, additional reactors were later constructed to continue the production of plutonium. The last of Hanford's reactors were shut down in the 1987 but nuclear waste still remains at the site, and its clean-up is ongoing issue.