FM 480th ST over Little Sioux River
PoorPosted for loadClay County, Iowa · 094362001 · Structure no. 000000000020450
- Built
- 1954
- 71 years old
- Condition
- Poor
- inspected March 2023
- Type
- Stringer/Multi-beam or Girder
- Concrete Continuous
- Length
- 378 ft
- 5 main spans
- Daily traffic
- 369
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
FM 480th ST over Little Sioux River is a concrete continuous stringer/multi-beam or girder carrying FM 480th ST over Little Sioux River in Clay County, Iowa. It was built in 1954, so it is 71 years old, older than the Iowa average of 45.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.
It carries about 369 vehicles a day, roughly 30% of them trucks, projected to reach 369 by 2043. The structure is 378 ft (115.2 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, 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 FM 480th ST over Little Sioux River built?
It was built in 1954, making it 71 years old in 2025.
What condition is FM 480th ST over Little Sioux River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2023.
How much traffic does FM 480th ST over Little Sioux River carry?
About 369 vehicles per day (2022 count), of which roughly 30% are trucks.
How long is FM 480th ST over Little Sioux River?
The structure is 378 ft (115.2 m) long with a longest span of 83 ft (25.3 m) and a deck 33 ft wide.
Who owns FM 480th ST over Little Sioux River?
It is owned by the County Highway Agency.