US 18 over Little Sioux River
FairClay County, Iowa · 2.1 Mi. W of W JCT US 71 · Structure no. 000000000020320
- Built
- 1930
- 95 years old, rebuilt 1958
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 179 ft
- 2 main spans
- Daily traffic
- 2,560
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
US 18 over Little Sioux River is a prestressed concrete stringer/multi-beam or girder carrying US 18 over Little Sioux River in Clay County, Iowa. It was built in 1930 and reconstructed in 1958, so it is 95 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 5 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 2,560 vehicles a day, roughly 30% of them trucks, projected to reach 2,560 by 2043. The structure is 179 ft (54.6 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 18 over Little Sioux River built?
It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1958.
What condition is US 18 over Little Sioux River 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 US 18 over Little Sioux River carry?
About 2,560 vehicles per day (2022 count), of which roughly 30% are trucks.
How long is US 18 over Little Sioux River?
The structure is 179 ft (54.6 m) long with a longest span of 46 ft (14 m) and a deck 32 ft wide.
Who owns US 18 over Little Sioux River?
It is owned by the State Highway Agency.