I 29 NB over US 30
FairHarrison County, Iowa · At Jct. US 30 · Structure no. 000000000028100
- Built
- 1967
- 58 years old
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 222 ft
- 4 main spans
- Daily traffic
- 7,500
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
I 29 NB over US 30 is a prestressed concrete stringer/multi-beam or girder carrying I 29 NB over US 30 in Harrison County, Iowa. It was built in 1967, so it is 58 years old, older than the Iowa average of 45.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 7,500 vehicles a day, roughly 30% of them trucks, projected to reach 7,500 by 2043. The structure is 222 ft (67.7 m) long and 42 ft wide.
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 29 NB over US 30 built?
It was built in 1967, making it 58 years old in 2025.
What condition is I 29 NB over US 30 in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2023.
How much traffic does I 29 NB over US 30 carry?
About 7,500 vehicles per day (2022 count), of which roughly 30% are trucks.
How long is I 29 NB over US 30?
The structure is 222 ft (67.7 m) long with a longest span of 69 ft (21 m) and a deck 42 ft wide.
Who owns I 29 NB over US 30?
It is owned by the State Highway Agency.