Of historic significance is a mural high up on the lobby's east wall. "The New Calf" was painted by Fort Dodge native Thomas Savage (1908-1987), a farmer and protege of Iowa artist Grant Wood. Often mistaken for WPA (Works Progress Administration) art, most 1930s post office murals, including "The New Calf," were painted by artists funded by the U.S. Treasury Department's Section of Painting and Sculpture, according to the U.S. Postal Museum.

The 14-by-6 foot, 10 inches oil-on-canvas mural was hung in April 1938. In keeping with standards for public art in federal buildings, the scene reflects America's history and way of life: A young farmer holds a newborn calf while another drives a wagon loaded with bags of flour found at the mill in the background. The mill is believed to be the "Eureka," of of three powered by the Raccoon river west of Jefferson.

Under the program, one percent of building construction funds was set aside for embellishment of federal buildings. Savage was paid $560 for his work.

Other decorative parts of the building include a brass art deco eagle, modeled in profile with upraised wings over the front doors...