US 18 & 71 over Little Sioux River
GoodClay County, Iowa · 0.7 Mi. W of E Jct. US 71 · Structure no. 000000000020331
- Built
- 2006
- 19 years old
- Condition
- Good
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 459 ft
- 4 main spans
- Daily traffic
- 16,900
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
US 18 & 71 over Little Sioux River is a prestressed concrete stringer/multi-beam or girder carrying US 18 & 71 over Little Sioux River in Clay County, Iowa. It was built in 2006, so it is 19 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 16,900 vehicles a day, roughly 4% of them trucks, projected to reach 16,900 by 2044. The structure is 459 ft (139.9 m) long and 73 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 18 & 71 over Little Sioux River built?
It was built in 2006, making it 19 years old in 2025.
What condition is US 18 & 71 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 September 2024.
How much traffic does US 18 & 71 over Little Sioux River carry?
About 16,900 vehicles per day (2022 count), of which roughly 4% are trucks.
How long is US 18 & 71 over Little Sioux River?
The structure is 459 ft (139.9 m) long with a longest span of 117 ft (35.7 m) and a deck 73 ft wide.
Who owns US 18 & 71 over Little Sioux River?
It is owned by the State Highway Agency.