NB I-29 over Drainage Ditch
FairHarrison County, Iowa · 1.8 Mi. N of JCT.127 · Structure no. 000000000028300
- Built
- 1967
- 58 years old
- Condition
- Fair
- inspected February 2024
- Type
- Slab
- Concrete Continuous
- Length
- 92 ft
- 3 main spans
- Daily traffic
- 7,300
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
NB I-29 over Drainage Ditch is a concrete continuous slab carrying NB I-29 over Drainage Ditch 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 7,300 vehicles a day, roughly 32% of them trucks, projected to reach 7,300 by 2044. The structure is 92 ft (28 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
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was NB I-29 over Drainage Ditch built?
It was built in 1967, making it 58 years old in 2025.
What condition is NB I-29 over Drainage Ditch 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 February 2024.
How much traffic does NB I-29 over Drainage Ditch carry?
About 7,300 vehicles per day (2022 count), of which roughly 32% are trucks.
How long is NB I-29 over Drainage Ditch?
The structure is 92 ft (28 m) long with a longest span of 35 ft (10.7 m) and a deck 43 ft wide.
Who owns NB I-29 over Drainage Ditch?
It is owned by the State Highway Agency.