U.S. Federal Route 30 runs east-west across Central Marshall County. Around the southside of Marshalltown, this is a controlled access expressway. As of April, 2004, IADOT was in the process of expanding the highway with at-grade intersections to Le Grand. At Marshalltown this has a spur through town. It follows the old path of U.S. Rt. 30. U.S. Rt. 30 passes through the following towns in Marshall County. Marshalltown Le Grand U.S. Rt. 30 is not multi-plexed in Marshall County. U.S. Rt. 30 intersects the following highways in Marshall County. Iowa State Route 330, near Marshalltown. BUSN U.S. Rt. 30, at Marshalltown. Iowa State Route 14, at Marshalltown. BUSN U.S. Rt. 30, at Marshalltown. Iowa State Route 146, at Le Grand.
Branches of U.S. Rt. 30 in Marshall County. A BGS on NB IA St Rt 330. A guide marker on NB IA St Rt 330. A guide marker on WB BUSN U.S. Rt. 30. Looking west along the new section for the EB lanes of U.S. Rt. 30 at Marshall County Highway T31. (April 12, 2004) Looking west along U.S. Rt. 30 at the current end of the new four-lane at-grade highway, near Le Grand. The new EB lanes are not open yet. From the left-to-right; Left-Future EB Lanes, Right-Future WB Lanes/Current U.S. Rt. 30. (April 12th, 2004) A junction marker on NB IA St Rt 146.
