315th ST over Mosquito Creek
PoorPosted for loadHarrison County, Iowa · 078412003 · Structure no. 000000000177050
- Built
- 1930
- 95 years old, rebuilt 1993
- Condition
- Poor
- inspected December 2024
- Type
- Truss - Thru
- Steel
- Length
- 222 ft
- 2 main spans
- Daily traffic
- 20
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
315th ST over Mosquito Creek is a steel truss - thru carrying 315th ST over Mosquito Creek in Harrison County, Iowa. It was built in 1930 and reconstructed in 1993, so it is 95 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 20 vehicles a day, projected to reach 20 by 2044. The structure is 222 ft (67.7 m) long and 17 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 315th ST over Mosquito Creek built?
It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1993.
What condition is 315th ST over Mosquito Creek 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 December 2024.
How much traffic does 315th ST over Mosquito Creek carry?
About 20 vehicles per day (2022 count).
How long is 315th ST over Mosquito Creek?
The structure is 222 ft (67.7 m) long with a longest span of 90 ft (27.4 m) and a deck 17 ft wide.
Who owns 315th ST over Mosquito Creek?
It is owned by the County Highway Agency.