From the record
“Post Office-Springville Main at 309 South Main Street in Springville, Utah, United States was built in 1941. It was built in Colonial Revival style and credited to supervising architect Louis A.”
Wikipedia article United States Post Office-Springville Main, CC BY-SA 4.0.
One of 83 National Register listings published here for Sanpete County · listed in 1989 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service