Oak Ridge site - Manhattan Project National Historical Park

map of Oak Ridge, Tennessee site

The Clinton Engineer Works, which became the Oak Ridge Reservation, was the administrative and military headquarters for the Manhattan Project and home to more than 75,000 people who built and operated the city and industrial complex in the hills of East Tennessee.

The Oak Ridge Reservation included three parallel industrial processes for uranium enrichment and experimental plutonium production.

The Oak Ridge site includes

  • X-10 Graphite Reactor National Historic Landmark, a pilot nuclear reactor which produced small quantities of plutonium;
  • Buildings 9731 and 9204-3 at the Y-12 complex, home to the electromagnetic separation process for uranium enrichment;
  • K-25 Building site, where gaseous diffusion uranium enrichment technology was pioneered. Buildings 9731, 9204-3 and K-25 together enriched a portion of the material for the uranium bomb.
X-10 Graphite Reactor with workers
X-10 Graphite Reactor with workers

Department of Energy

Directions and Transportation

Oak Ridge Reservation bus tour is included in the price of admission to the American Museum of Science and Energy, and includes a 3-hour tour of:

  • X-10 Graphite Reactor
  • New Bethel Church at Oak Ridge National Laboratory
  • The visitor overlook at the East Tennessee Technology Park (former home to the K-25 gaseous diffusion building)
  • Y-12 New Hope History Center
The tour runs March through November. Dates and times vary from week to week. Please contact the American Museum of Science & Energy for the latest information.

Please note: Participants must be United States citizens.

A virtual tour of the K-25 Building can be found at the new K-25 virtual Museum website.

Last updated: July 18, 2016

Contact the Park

Mailing Address:

Manhattan Project National Historical Park
c/o NPS Intermountain Regional Office
P.O. Box 25287

Denver, CO 80225-0287


(505) 661-6277
This phone number is for the Los Alamos Unit Visitor Center. You may also contact the Oak Ridge Unit Visitor Center at (865) 576-6767 or the Hanford Unit Visitor Center at (509) 376-1647.

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