FM over Boone River
PoorHamilton County, Iowa · 089251701 · Structure no. 000000000172320
- Built
- 1955
- 70 years old
- Condition
- Poor
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 304 ft
- 3 main spans
- Daily traffic
- 60
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
FM over Boone River is a steel continuous stringer/multi-beam or girder carrying FM over Boone River in Hamilton County, Iowa. It was built in 1955, so it is 70 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 4 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 60 vehicles a day, roughly 18% of them trucks, projected to reach 60 by 2044. The structure is 304 ft (92.7 m) long and 22 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 1955, making it 70 years old in 2025.
What condition is FM over Boone River 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 September 2024.
How much traffic does FM over Boone River carry?
About 60 vehicles per day (2022 count), of which roughly 18% are trucks.
How long is FM over Boone River?
The structure is 304 ft (92.7 m) long with a longest span of 117 ft (35.7 m) and a deck 22 ft wide.
Who owns FM over Boone River?
It is owned by the County Highway Agency.