FM over Nishnabotna River
FairAudubon County, Iowa · 078350409 · Structure no. 000000000361280
- Built
- 1958
- 67 years old
- Condition
- Fair
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 182 ft
- 3 main spans
- Daily traffic
- 597
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
FM over Nishnabotna River is a prestressed concrete stringer/multi-beam or girder carrying FM over Nishnabotna River in Audubon County, Iowa. It was built in 1958, so it is 67 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 597 vehicles a day, roughly 6% of them trucks, projected to reach 597 by 2044. The structure is 182 ft (55.5 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 Nishnabotna River built?
It was built in 1958, making it 67 years old in 2025.
What condition is FM over Nishnabotna 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 April 2024.
How much traffic does FM over Nishnabotna River carry?
About 597 vehicles per day (2022 count), of which roughly 6% are trucks.
How long is FM over Nishnabotna River?
The structure is 182 ft (55.5 m) long with a longest span of 69 ft (21 m) and a deck 27 ft wide.
Who owns FM over Nishnabotna River?
It is owned by the County Highway Agency.