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. (2009)
- 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.
| 2011 Public Road Length - Miles by Ownership | ||
|---|---|---|
Ownership |
Miles | |
| Iowa DOT | 8,893* |
|
| Counties | 89,841 |
|
| Municipalities | 14,904 |
|
| Parks and institutions | 619 |
|
| Federal agencies | 127 |
|
| Total miles | 114,384* |
|
9,387 miles of roadway, including 494 miles of ramps.
| 2011 Bridges - Number of Bridges | ||
|---|---|---|
Ownership |
Bridges | |
| Iowa DOT | 4,073 | |
| Counties | 19,274 | |
| Municipalities | 1,117 | |
| State parks | 4 | |
| Local parks | 3 | |
| Other state agencies | 18 | |
| Private | 12 | |
| Railroad | 368 | |
| Local toll | 2 | |
| Bureau of Indian Affairs | 1 | |
| Bureau of Fish and Wildlife | 1 | |
| National Park Service | 2 | |
| Corps of Engineers | 2 | |
| Army | 18 | |
| Unknown | 54 | |
| Total | 24,799 | |
| Railroad bridges over highways maintained by the Iowa DOT (Updated: July 2011) | ||
|---|---|---|
Description |
Quantity | |
| Number of railroad bridges over highways maintained by the Iowa DOT | 69 | |
| Number of railroad bridges over Primary Highway System routes | 63 | |
| Number of railroad bridges over interstate routes | 6 | |
| Number of railroad bridges for which the Iowa DOT has some maintenance/inspection responsibility | 15 | |
| Number of railroad bridges less than 25 years old | 6 | |
| Number of railroad bridges between 26 and 50 years old | 25 | |
| Number of railroad bridges between 51 and70 years old | 14 | |
| Number of railroad bridges with age unknown | 2 | |
| Oldest railroad bridge over a highway maintained by the Iowa DOT | 84 years | |
| Newest railroad bridge over a highway maintained by the Iowa DOT | 3 years | |
Bridge Rating Definitions
Primary Highway System - Age of Bridges by Decade
- Bridge Age by Decade on Primary System April 1 2009
- Bridge Age by Decade on Primary System April 1 2008
- Bridge Age by Decade on Primary System April 1 2007
Primary Highway System – Condition of Bridges
- Condition of Bridges April 1 2007
- Condition of Bridges April 1 2006
- Condition of Bridges April 1 2005
- Condition of Bridges April 1 2004
Primary Highway System and Interstate System – Condition of Bridges
- Condition of Primary and Interstate Bridges April 1 2009
- Condition of Primary and Interstate Bridges April 1 2008
- Condition of Primary and Interstate Bridges 2004
Primary Highway System – Pavement Condition
- Primary Highway System Pavement Condition and Age Jan 27 2008
- Primary Highway System Pavement Condition March 12 2007
- Primary Highway System Pavement Condition 2003
