FM over Dm River
FairHumboldt County, Iowa · 091281904 · Structure no. 000000000184310
- Built
- 1961
- 64 years old
- Condition
- Fair
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 251 ft
- 4 main spans
- Daily traffic
- 559
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
FM over Dm River is a prestressed concrete continuous stringer/multi-beam or girder carrying FM over Dm River in Humboldt County, Iowa. It was built in 1961, so it is 64 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 559 vehicles a day, roughly 13% of them trucks, projected to reach 559 by 2044. The structure is 251 ft (76.5 m) long and 29 ft wide. If it were closed, the detour would be 8.7 mi (14 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| 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 Dm River built?
It was built in 1961, making it 64 years old in 2025.
What condition is FM over Dm 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 November 2024.
How much traffic does FM over Dm River carry?
About 559 vehicles per day (2022 count), of which roughly 13% are trucks.
How long is FM over Dm River?
The structure is 251 ft (76.5 m) long with a longest span of 69 ft (21 m) and a deck 29 ft wide.
Who owns FM over Dm River?
It is owned by the County Highway Agency.