US 18 over Unnamed Creek
FairClayton County, Iowa · 0.1 Mi. E of Jct. SR B45 · Structure no. 000000000605900
- Built
- 1988
- 37 years old
- Condition
- Fair
- inspected November 2023
- Type
- Culvert
- Concrete Continuous
- Length
- 44 ft
- 2 main spans
- Daily traffic
- 4,730
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
US 18 over Unnamed Creek is a concrete continuous culvert carrying US 18 over Unnamed Creek in Clayton County, Iowa. It was built in 1988, so it is 37 years old, younger 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 4,730 vehicles a day, roughly 13% of them trucks, projected to reach 4,730 by 2043. The structure is 44 ft (13.4 m) long. 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 |
|---|---|---|
| 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 US 18 over Unnamed Creek built?
It was built in 1988, making it 37 years old in 2025.
What condition is US 18 over Unnamed Creek 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 November 2023.
How much traffic does US 18 over Unnamed Creek carry?
About 4,730 vehicles per day (2022 count), of which roughly 13% are trucks.
How long is US 18 over Unnamed Creek?
The structure is 44 ft (13.4 m) long with a longest span of 12 ft (3.7 m).
Who owns US 18 over Unnamed Creek?
It is owned by the State Highway Agency.