NB Ia 60 over 450th Street
GoodSioux County, Iowa · 0.9 Mi. N of Jct. Ia 10 · Structure no. 000000000608840
- Built
- 2003
- 22 years old
- Condition
- Good
- inspected January 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 169 ft
- 3 main spans
- Daily traffic
- 1,880
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
NB Ia 60 over 450th Street is a prestressed concrete stringer/multi-beam or girder carrying NB Ia 60 over 450th Street in Sioux County, Iowa. It was built in 2003, so it is 22 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 1,880 vehicles a day, roughly 34% of them trucks, projected to reach 1,880 by 2044. The structure is 169 ft (51.5 m) long and 43 ft wide.
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 | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was NB Ia 60 over 450th Street built?
It was built in 2003, making it 22 years old in 2025.
What condition is NB Ia 60 over 450th Street 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 60 over 450th Street carry?
About 1,880 vehicles per day (2022 count), of which roughly 34% are trucks.
How long is NB Ia 60 over 450th Street?
The structure is 169 ft (51.5 m) long with a longest span of 72 ft (21.9 m) and a deck 43 ft wide.
Who owns NB Ia 60 over 450th Street?
It is owned by the State Highway Agency.