About the DOT

Roads, Streets, and Bridges

  • There are more public road miles in Iowa than interstate miles in the entire 50 states.
  • Iowa ranks 14th in the nation in number of miles of roadway. (2013)
  • There are approximately 38 miles of road for every 1,000 people in Iowa.
  • There are 2,664 bridge structures in Iowa that are made primarily of wood.

2014 Public Road Length - Miles by Ownership
Ownership Miles
Iowa DOT 8,871*
Counties 89,818
Municipalities 15,037
Parks and institutions 622
Federal agencies 138
Total miles 114,486*

*Totals exclude ramps. The Iowa DOT maintains 9,403 miles of roadway, including 532 miles of ramps.


2014 BRIDGES - NUMBER OF BRIDGES
Ownership Bridges
Iowa DOT 4,101
Counties 18,930
Municipalities 1,147
State parks 6
Local parks 3
Other state agencies 15
Private 1
Railroad 360
Local toll 1
Bureau of Indian Affairs 3
Bureau of Fish and Wildlife 5
National Park Service 2
Corps of Engineers 6
Army 18
Total 24,598


Bridge Rating Definitions


Primary Highway System - Age of Bridges by Decade


Primary Highway System - Condition of Bridges


Primary Highway System and Interstate System - Condition of Bridges


Primary Highway System – Pavement Condition