310th ST over Drainage
PoorStory County, Iowa · 082212001 · Structure no. 000000000313530
- Built
- 1951
- 74 years old, rebuilt 1988
- Condition
- Poor
- inspected January 2023
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 25 ft
- 1 main span
- Daily traffic
- 90
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
310th ST over Drainage is a wood or timber stringer/multi-beam or girder carrying 310th ST over Drainage in Story County, Iowa. It was built in 1951 and reconstructed in 1988, so it is 74 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.
It carries about 90 vehicles a day, projected to reach 90 by 2043. The structure is 25 ft (7.6 m) long and 24 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 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 310th ST over Drainage built?
It was built in 1951, making it 74 years old in 2025. It was reconstructed in 1988.
What condition is 310th ST over Drainage 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 January 2023.
How much traffic does 310th ST over Drainage carry?
About 90 vehicles per day (2022 count).
How long is 310th ST over Drainage?
The structure is 25 ft (7.6 m) long with a longest span of 23 ft (7 m) and a deck 24 ft wide.
Who owns 310th ST over Drainage?
It is owned by the County Highway Agency.