FM over Boone River
FairHamilton County, Iowa · 087261406 · Structure no. 000000000171531
- Built
- 1973
- 52 years old, rebuilt 2015
- Condition
- Fair
- inspected September 2022
- Type
- Girder and Floorbeam System
- Steel Continuous
- Length
- 390 ft
- 3 main spans
- Daily traffic
- 429
- 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 1973 and reconstructed in 2015, 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 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 429 vehicles a day, roughly 13% of them trucks, projected to reach 429 by 2043. The structure is 390 ft (118.9 m) long and 32 ft wide. If it were closed, the detour would be 8.1 mi (13 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was FM over Boone River built?
It was built in 1973, making it 52 years old in 2025. It was reconstructed in 2015.
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 2022.
How much traffic does FM over Boone River carry?
About 429 vehicles per day (2022 count), of which roughly 13% are trucks.
How long is FM over Boone River?
The structure is 390 ft (118.9 m) long with a longest span of 150 ft (45.7 m) and a deck 32 ft wide.
Who owns FM over Boone River?
It is owned by the County Highway Agency.