US 20 WB over Ia 4
GoodCalhoun County, Iowa · U.S. 20 over Ia 4 · Structure no. 000000000609740
- Built
- 2012
- 13 years old
- Condition
- Good
- inspected March 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 191 ft
- 3 main spans
- Daily traffic
- 2,410
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
US 20 WB over Ia 4 is a prestressed concrete stringer/multi-beam or girder carrying US 20 WB over Ia 4 in Calhoun County, Iowa. It was built in 2012, so it is 13 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 2,410 vehicles a day, roughly 32% of them trucks, projected to reach 2,410 by 2042. The structure is 191 ft (58.2 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 | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 20 WB over Ia 4 built?
It was built in 2012, making it 13 years old in 2025.
What condition is US 20 WB over Ia 4 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 March 2023.
How much traffic does US 20 WB over Ia 4 carry?
About 2,410 vehicles per day (2022 count), of which roughly 32% are trucks.
How long is US 20 WB over Ia 4?
The structure is 191 ft (58.2 m) long with a longest span of 107 ft (32.5 m) and a deck 43 ft wide.
Who owns US 20 WB over Ia 4?
It is owned by the State Highway Agency.