390th over Rock Creek
PoorMitchell County, Iowa · 098180701 · Structure no. 000000000248091
- Built
- 1973
- 52 years old
- Condition
- Poor
- inspected December 2023
- Type
- Slab
- Concrete
- Length
- 32 ft
- 1 main span
- Daily traffic
- 216
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
390th over Rock Creek is a concrete slab carrying 390th over Rock Creek in Mitchell County, Iowa. It was built in 1973, so it is 52 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.
It carries about 216 vehicles a day, roughly 19% of them trucks, projected to reach 216 by 2043. The structure is 32 ft (9.8 m) long and 32 ft wide. If it were closed, the detour would be 19.9 mi (32 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 | 7 Good | Some minor problems. |
| Substructure | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Channel and channel protection | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 390th over Rock Creek built?
It was built in 1973, making it 52 years old in 2025.
What condition is 390th over Rock 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 2023.
How much traffic does 390th over Rock Creek carry?
About 216 vehicles per day (2022 count), of which roughly 19% are trucks.
How long is 390th over Rock Creek?
The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.
Who owns 390th over Rock Creek?
It is owned by the County Highway Agency.