380th over Rock
GoodMitchell County, Iowa · 098181601 · Structure no. 000000000248130
- Built
- 1970
- 55 years old
- Condition
- Good
- inspected December 2023
- Type
- Slab
- Concrete Continuous
- Length
- 75 ft
- 3 main spans
- Daily traffic
- 177
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
380th over Rock is a concrete continuous slab carrying 380th over Rock in Mitchell County, Iowa. It was built in 1970, so it is 55 years old, older than the Iowa average of 45.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 177 vehicles a day, roughly 13% of them trucks, projected to reach 177 by 2043. The structure is 75 ft (22.9 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 380th over Rock built?
It was built in 1970, making it 55 years old in 2025.
What condition is 380th over Rock in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.
How much traffic does 380th over Rock carry?
About 177 vehicles per day (2022 count), of which roughly 13% are trucks.
How long is 380th over Rock?
The structure is 75 ft (22.9 m) long with a longest span of 29 ft (8.8 m) and a deck 30 ft wide.
Who owns 380th over Rock?
It is owned by the County Highway Agency.