First Self-Sustaining Nuclear Reaction, Site of
Also known as: The Enrico Fermi Memorial
Approximate location: the National Park Service places this pin arbitrarily within the property, not at a surveyed point (stated accuracy ±12 m).
Why it's listed
A grassy plot on the University of Chicago campus marks the place where the nuclear age began. Beneath the West Stands of Stagg Field, a converted squash-rackets court measuring 30 by 60 feet held the 'Chicago Pile,' a stack of graphite bricks and uranium oxide built under Enrico Fermi's direction. On December 2, 1942, after a day of stops and restarts, Fermi and his colleagues watched the pile become self-sustaining and run for twenty-eight minutes. The work was part of the American effort to produce an atomic bomb. The vine-covered West Stands were demolished in 1958 because of radiation and unsound condition, and a library now occupies much of the old field. In 1967 a twelve-foot bronze sculpture by Henry Moore, titled 'Nuclear Energy,' was dedicated on the spot. Plaques beside it identify the site as a national historic landmark. The nominated area is under one acre.
Significance in brief: On December 2, 1942, scientists led by Enrico Fermi achieved the first controlled, self-sustaining nuclear chain reaction in the 'Chicago Pile' here. The experiment gave humanity a means of releasing nuclear energy and was central to the wartime effort to develop an atomic bomb. The site is marked by a memorial sculpture installed in 1967.
Machine-generated summary. This summary was generated by a language model from the official nomination document and has not been reviewed line by line by an editor. It may contain errors. Check the source document before relying on any detail. Source: nomination document (PDF) · National Archives catalog entry. NRHP reference 66000314, listed October 15, 1966. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence medium).
Key facts
| Address | S. Ellis Ave. between E. 56th and 57th Sts., Chicago |
|---|---|
| County | Cook County |
| Listed | October 15, 1966 |
| Reference number | 66000314 |
| Resource type | Site |
| Period of significance | 1942 |
| Architect / builder | Sculptor Henry Moore (memorial sculpture) |
| Areas of significance | Science |
| Level of significance | National |
| National Historic Landmark | Yes, designated February 18, 1965 |
| Status (as stated in the nomination) | The West Stands were torn down in 1958; the site is now a memorial plot with the Henry Moore sculpture, listed in excellent condition and publicly owned. |
| Acreage | 0.9 |
| Within district | Chicago Park Boulevard System Historic District |
| Coordinates | 41.79245, -87.60109 (NPS GIS) |
What listing means for this property
Sites (archaeological sites, battlefields, landscapes) are often listed with a restricted address to protect them from looting or disturbance. Listing is honorary for private owners; federal undertakings on or near the site go through Section 106 review, and state laws may protect burials and artefacts regardless of listing.
General information, not legal or tax advice. Rules change; confirm with your State Historic Preservation Office or a qualified adviser.
Sources and further reading
- National Park Service, National Register of Historic Places database (snapshot May 2026), reference 66000314.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q284681
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.