US 18 over Little Sioux River
GoodClay County, Iowa · 3.1 Mi. E of E Jct. US 71 · Structure no. 000000000020341
- Built
- 2010
- 15 years old
- Condition
- Good
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 538 ft
- 4 main spans
- Daily traffic
- 4,170
- 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 2010, so it is 15 years old, younger than the Iowa average of 45.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 4,170 vehicles a day, roughly 16% of them trucks, projected to reach 4,170 by 2044. The structure is 538 ft (164 m) long and 47 ft wide. If it were closed, the detour would be 1.9 mi (3 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 18 over Little Sioux River built?
It was built in 2010, making it 15 years old in 2025.
What condition is US 18 over Little Sioux River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.
How much traffic does US 18 over Little Sioux River carry?
About 4,170 vehicles per day (2022 count), of which roughly 16% are trucks.
How long is US 18 over Little Sioux River?
The structure is 538 ft (164 m) long with a longest span of 137 ft (41.8 m) and a deck 47 ft wide.
Who owns US 18 over Little Sioux River?
It is owned by the State Highway Agency.