Iowa 12 over I-29
GoodWoodbury County, Iowa · At Jct. I-29 · Structure no. 000000000053921
- Built
- 2009
- 16 years old
- Condition
- Good
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 242 ft
- 2 main spans
- Daily traffic
- 8,200
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Iowa 12 over I-29 is a prestressed concrete stringer/multi-beam or girder carrying Iowa 12 over I-29 in Woodbury County, Iowa. It was built in 2009, so it is 16 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 8,200 vehicles a day, roughly 4% of them trucks, projected to reach 8,200 by 2043. The structure is 242 ft (73.8 m) long and 32 ft wide. If it were closed, the detour would be 9.9 mi (16 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Iowa 12 over I-29 built?
It was built in 2009, making it 16 years old in 2025.
What condition is Iowa 12 over I-29 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 October 2023.
How much traffic does Iowa 12 over I-29 carry?
About 8,200 vehicles per day (2022 count), of which roughly 4% are trucks.
How long is Iowa 12 over I-29?
The structure is 242 ft (73.8 m) long with a longest span of 126 ft (38.4 m) and a deck 32 ft wide.
Who owns Iowa 12 over I-29?
It is owned by the State Highway Agency.