CM and StP Railroad Underpass is a historic structure located southwest of Washington, Iowa, United States.

It was listed on the National Register of Historic Places in 1998.

[2] Given the relatively flat nature of Iowa's rivers and streams this bridge type was rarely built in the state, and was mostly built for railroad use.

[2] This bridge, completed in 1903 by the Chicago, Milwaukee, St. Paul & Pacific Railroad (known as simply The Milwaukee Road), crosses a county highway bridge and the west fork of Crooked Creek.

This article about a property in Washington County, Iowa on the National Register of Historic Places is a stub.