Timeline of events: 1939-2008
1939 / January 1942
April 1942 / December 1942
1942-1958
July 1945
August 1945 / 1946
1957-1962
1962 / 1966
1969 / 1970
1973 / 1974
1976 / 1995
1998 / 2008
The History of the St. Louis Uranium Processing Plant Radioactive Waste Sites by the St. Louis Remediation Task Force, May 13, 1996. [Source]
The first secret city 
Very helpful information. By the way, I think that the name of the field at the University of Chicago was Stagg Field rather than Staff Field. It was named after their pioneering football coach, Amos Alonzo Stagg.
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