National and State Register

Rocky Flats Plant

Jefferson County

The nationally significant Rocky Flats Plant functioned as a major center for the development and production of atomic weapons for the US military. 

A black and white photo with blue labels of an overhead shot of the facilities.

Rocky Flats Plant 

It operated from 1951 until its closure in 1989 as the Cold War ended.  Its particular significance stems from its role as the sole producer of triggers for nuclear weapons from 1964 to 1989.