FM over Dm River
GoodMahaska County, Iowa · 074160504 · Structure no. 000000000235631
- Built
- 2010
- 15 years old
- Condition
- Good
- inspected December 2024
- Type
- Girder and Floorbeam System
- Steel Continuous
- Length
- 1,139 ft
- 9 main spans
- Daily traffic
- 620
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
FM over Dm River is a steel continuous girder and floorbeam system carrying FM over Dm River in Mahaska County, Iowa. It was built in 2010, so it is 15 years old, younger than the Iowa average of 45.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 620 vehicles a day, roughly 16% of them trucks, projected to reach 620 by 2044. The structure is 1,139 ft (347.2 m) long and 33 ft wide. If it were closed, the detour would be 123.7 mi (199 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| 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 Dm River built?
It was built in 2010, making it 15 years old in 2025.
What condition is FM over Dm River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2024.
How much traffic does FM over Dm River carry?
About 620 vehicles per day (2022 count), of which roughly 16% are trucks.
How long is FM over Dm River?
The structure is 1,139 ft (347.2 m) long with a longest span of 133 ft (40.5 m) and a deck 33 ft wide.
Who owns FM over Dm River?
It is owned by the County Highway Agency.