Ia 1 over Drainage Ditch
FairJohnson County, Iowa · 0.6 Mi. N of Jct. US 218 · Structure no. 000000000031711
- Built
- 1949
- 76 years old, rebuilt 1981
- Condition
- Fair
- inspected October 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 52 ft
- 3 main spans
- Daily traffic
- 19,000
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Ia 1 over Drainage Ditch is a concrete continuous culvert carrying Ia 1 over Drainage Ditch in Johnson County, Iowa. It was built in 1949 and reconstructed in 1981, so it is 76 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 19,000 vehicles a day, roughly 4% of them trucks, projected to reach 19,000 by 2044. The structure is 52 ft (15.9 m) long. If it were closed, the detour would be 3.7 mi (6 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 |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ia 1 over Drainage Ditch built?
It was built in 1949, making it 76 years old in 2025. It was reconstructed in 1981.
What condition is Ia 1 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 October 2024.
How much traffic does Ia 1 over Drainage Ditch carry?
About 19,000 vehicles per day (2022 count), of which roughly 4% are trucks.
How long is Ia 1 over Drainage Ditch?
The structure is 52 ft (15.9 m) long with a longest span of 18 ft (5.5 m).
Who owns Ia 1 over Drainage Ditch?
It is owned by the State Highway Agency.