FM over Rock River
FairSioux County, Iowa · 095470603 · Structure no. 000000000310750
- Built
- 1969
- 56 years old
- Condition
- Fair
- inspected February 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 549 ft
- 6 main spans
- Daily traffic
- 139
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
FM over Rock River is a steel continuous stringer/multi-beam or girder carrying FM over Rock River in Sioux County, Iowa. It was built in 1969, so it is 56 years old, older than the Iowa average of 45.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 139 vehicles a day, projected to reach 139 by 2043. The structure is 549 ft (167.3 m) long and 30 ft wide. If it were closed, the detour would be 9.9 mi (16 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was FM over Rock River built?
It was built in 1969, making it 56 years old in 2025.
What condition is FM over Rock River in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in February 2023.
How much traffic does FM over Rock River carry?
About 139 vehicles per day (2022 count).
How long is FM over Rock River?
The structure is 549 ft (167.3 m) long with a longest span of 98 ft (29.9 m) and a deck 30 ft wide.
Who owns FM over Rock River?
It is owned by the County Highway Agency.