NB Ia 1 over US 218
GoodJohnson County, Iowa · At JCT U.S. 218 · Structure no. 000000000605540
- Built
- 1983
- 42 years old
- Condition
- Good
- inspected January 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 268 ft
- 4 main spans
- Daily traffic
- 7,650
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
NB Ia 1 over US 218 is a prestressed concrete stringer/multi-beam or girder carrying NB Ia 1 over US 218 in Johnson County, Iowa. It was built in 1983, so it is 42 years old, younger 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 7,650 vehicles a day, roughly 6% of them trucks, projected to reach 7,650 by 2044. The structure is 268 ft (81.7 m) long and 43 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was NB Ia 1 over US 218 built?
It was built in 1983, making it 42 years old in 2025.
What condition is NB Ia 1 over US 218 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 January 2024.
How much traffic does NB Ia 1 over US 218 carry?
About 7,650 vehicles per day (2022 count), of which roughly 6% are trucks.
How long is NB Ia 1 over US 218?
The structure is 268 ft (81.7 m) long with a longest span of 92 ft (28 m) and a deck 43 ft wide.
Who owns NB Ia 1 over US 218?
It is owned by the State Highway Agency.