340th Street over Middle Silver Creek
FairPottawattamie County, Iowa · 076413504 · Structure no. 000000000288561
- Built
- 1998
- 27 years old
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 71 ft
- 1 main span
- Daily traffic
- 270
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
340th Street over Middle Silver Creek is a prestressed concrete stringer/multi-beam or girder carrying 340th Street over Middle Silver Creek in Pottawattamie County, Iowa. It was built in 1998, so it is 27 years old, younger 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 270 vehicles a day, roughly 20% of them trucks, projected to reach 270 by 2043. The structure is 71 ft (21.6 m) long and 33 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 | 8 Very Good | No problems noted. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 340th Street over Middle Silver Creek built?
It was built in 1998, making it 27 years old in 2025.
What condition is 340th Street over Middle 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 June 2023.
How much traffic does 340th Street over Middle Silver Creek carry?
About 270 vehicles per day (2022 count), of which roughly 20% are trucks.
How long is 340th Street over Middle Silver Creek?
The structure is 71 ft (21.6 m) long with a longest span of 69 ft (21 m) and a deck 33 ft wide.
Who owns 340th Street over Middle Silver Creek?
It is owned by the County Highway Agency.