Ia 1 SB over Iowa River
GoodJohnson County, Iowa · In Iowa City · Structure no. 000000000031730
- Built
- 1969
- 56 years old
- Condition
- Good
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 355 ft
- 3 main spans
- Daily traffic
- 10,950
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Ia 1 SB over Iowa River is a steel continuous stringer/multi-beam or girder carrying Ia 1 SB over Iowa River in Johnson County, Iowa. It was built in 1969, so it is 56 years old, older than the Iowa average of 45.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 10,950 vehicles a day, roughly 4% of them trucks, projected to reach 10,950 by 2043. The structure is 355 ft (108.2 m) long and 64 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ia 1 SB over Iowa River built?
It was built in 1969, making it 56 years old in 2025.
What condition is Ia 1 SB over Iowa River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.
How much traffic does Ia 1 SB over Iowa River carry?
About 10,950 vehicles per day (2022 count), of which roughly 4% are trucks.
How long is Ia 1 SB over Iowa River?
The structure is 355 ft (108.2 m) long with a longest span of 124 ft (37.8 m) and a deck 64 ft wide.
Who owns Ia 1 SB over Iowa River?
It is owned by the State Highway Agency.