page_title: Lake Ontario Ordnance Works
section_title: Building 401
hierarchical_section_title: Lake Ontario Ordnance Works / Buildings and operations / Building 401
caption_attribution_description: Building 401 - Niagara Falls Storage Site, Lewiston, New York
context_page_description: The former Lake Ontario Ordnance Works was a 7,500-acre military installation located in Niagara County, New York, United States, approximately 9.6 mi north of Niagara Falls.
  The property was purchased by the War Department during World War II as a location for the production of TNT. Most of the LOOW property was sold after the war.
  The United States Department of Energy currently owns 191 acres of the original LOOW property, on which the Niagara Falls Storage Site is located. The NFSS is used for the storage of radioactive materials produced during the development of America's first atom bombs.
  Approximately 93 percent of the original LOOW site—currently occupied by homes, a school, a campground, the Basilica of the National Shrine of Our Lady of Fatima, farms, local and federal government operations, and a toxic waste facility—meets the criteria of a Formerly Used Defense Site, and one portion of the property is listed as a Superfund cleanup site.
context_section_description: Beginning in 1943, Building 401 was used as the powerhouse for the production of TNT, though operations lasted less than a year.  Building 401 was renovated, and from 1953–59 and 1965–71, it was used as a Boron-10 isotope separation plant.  The interior of Building 401 was gutted in 1971, and its hardware and instrumentation were disposed of.  Building 401 was demolished in 2010.
caption: Building 401 prior to demolition in 2010.  The three silos were built to resemble a barn from the air.[8]
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