The WPA Stock Barn and Pavilion, or Rock Barn, in Trenton, Missouri, is a historic structure built in 1938 as part of the Works Progress Administration. This octagonal, two-story barn with attached stock pens is constructed from native stone on a concrete foundation. It functioned as a livestock housing and sales pavilion for the annual Grundy County agricultural fair.
In 1938, the WPA Stock Barn and Pavilion, also known as the Rock Barn, was constructed as a Works Progress Administration project. The barn is a two-story octagonal structure with attached stock pens, built of native stone on a concrete foundation and served as a livestock housing and sales pavilion for the annual Grundy County agricultural fair.
In 1994, the WPA Stock Barn and Pavilion was listed on the National Register of Historic Places.