FM over Boone River
FairHamilton County, Iowa · 089253101 · Structure no. 000000000172410
- Built
- 1964
- 61 years old, rebuilt 1986
- Condition
- Fair
- inspected September 2024
- Type
- Girder and Floorbeam System
- Steel Continuous
- Length
- 308 ft
- 3 main spans
- Daily traffic
- 499
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
FM over Boone River is a steel continuous girder and floorbeam system carrying FM over Boone River in Hamilton County, Iowa. It was built in 1964 and reconstructed in 1986, so it is 61 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 5 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 499 vehicles a day, roughly 22% of them trucks, projected to reach 499 by 2044. The structure is 308 ft (93.9 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 FM over Boone River built?
It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1986.
What condition is FM over Boone 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 September 2024.
How much traffic does FM over Boone River carry?
About 499 vehicles per day (2022 count), of which roughly 22% are trucks.
How long is FM over Boone River?
The structure is 308 ft (93.9 m) long with a longest span of 120 ft (36.6 m) and a deck 32 ft wide.
Who owns FM over Boone River?
It is owned by the County Highway Agency.