U.S. Federal Route 30 is the main east-west highway across Harrison County. This runs along the Boyer River. U.S. Rt. 30 passes thorugh the following towns in Harrison County. Dunlap Wodbine Logan Missouri Valley U.S. Rt. 30 is not multi-plexed in Harrison County. U.S. Rt. 30 intersects the following highways in Harrison County. Iowa State Route 37, at Dunlap. Iowa State Route 44, near Logan. Iowa State Route 127, at Logan. Interstate 29, near Missouri Valley.
