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. (2018)
- There are approximately 36 miles of road for every 1,000 people in Iowa.
- There are 1,481 bridge structures in Iowa that are made primarily of wood and currently open to traffic.
| 2019 Public Road Length - Miles by Ownership
|
|
| Ownership
|
Miles
|
| Iowa DOT
|
8,902*
|
| Counties
|
89,698
|
| Municipalities
|
15,442
|
| Parks and institutions
|
602
|
| Federal agencies
|
138
|
| Total miles
|
114,782*
|
*Totals exclude ramps. The Iowa DOT maintains 9,617 miles of roadway, including 715 miles of ramps.
| 2020 BRIDGES - NUMBER OF BRIDGES
|
|
| Ownership
|
Bridges
|
| Iowa DOT
|
4,144
|
| Counties
|
18,576
|
| Municipalities
|
1,190
|
| State parks
|
29
|
| Local parks
|
4
|
| Other state agencies
|
3
|
| Private
|
15
|
| Railroad
|
357
|
| Corp of Engineers
|
3
|
| Bureau of Indian Affairs
|
1
|
| Bureau of Fish and Wildlife
|
1
|
| National Park Service
|
2
|
| Corps of Engineers
|
6
|
| Total
|
24,325
|
Bridge Rating Definitions
- Good - Deck, Superstructure, and Substructure or Culvert condition ratings are 7, 8, or 9.
- Fair - One or more condition ratings for the Deck, Superstructure, Substructure, or Culvert are 5 or 6.
- Poor - One or more condition ratings for the Deck, Superstructure, Substructure, or Culvert are 4 or less.
Primary Highway System - Age of Bridges by Decade
Primary Highway System - Condition of Bridges