320th Street over Little Silver Creek
FairPottawattamie County, Iowa · 076412802 · Structure no. 000000000288520
- Built
- 1940
- 85 years old, rebuilt 1989
- Condition
- Fair
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 51 ft
- 1 main span
- Daily traffic
- 15
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
320th Street over Little Silver Creek is a steel stringer/multi-beam or girder carrying 320th Street over Little Silver Creek in Pottawattamie County, Iowa. It was built in 1940 and reconstructed in 1989, so it is 85 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 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 15 vehicles a day, projected to reach 15 by 2043. The structure is 51 ft (15.5 m) long and 18 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 320th Street over Little Silver Creek built?
It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1989.
What condition is 320th Street over Little Silver 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 April 2024.
How much traffic does 320th Street over Little Silver Creek carry?
About 15 vehicles per day (2022 count).
How long is 320th Street over Little Silver Creek?
The structure is 51 ft (15.5 m) long with a longest span of 31 ft (9.4 m) and a deck 18 ft wide.
Who owns 320th Street over Little Silver Creek?
It is owned by the County Highway Agency.