320th ST over Mud Creek
PoorPosted for loadPlymouth County, Iowa · 090443001 · Structure no. 000000000271170
- Built
- 1900
- 125 years old, rebuilt 1973
- Condition
- Poor
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 45 ft
- 1 main span
- Daily traffic
- 11
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
320th ST over Mud Creek is a steel stringer/multi-beam or girder carrying 320th ST over Mud Creek in Plymouth County, Iowa. It was built in 1900 and reconstructed in 1973, so it is 125 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 3 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 11 vehicles a day, projected to reach 11 by 2044. The structure is 45 ft (13.7 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 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 320th ST over Mud Creek built?
It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1973.
What condition is 320th ST over Mud 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 August 2024.
How much traffic does 320th ST over Mud Creek carry?
About 11 vehicles per day (2022 count).
How long is 320th ST over Mud Creek?
The structure is 45 ft (13.7 m) long with a longest span of 30 ft (9.1 m) and a deck 18 ft wide.
Who owns 320th ST over Mud Creek?
It is owned by the County Highway Agency.