FM - Boston over Nishnabotna River
PoorPosted for loadCass County, Iowa · 077361205 · Structure no. 000000000100960
- Built
- 1951
- 74 years old
- Condition
- Poor
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 213 ft
- 3 main spans
- Daily traffic
- 131
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
FM - Boston over Nishnabotna River is a steel continuous stringer/multi-beam or girder carrying FM - Boston over Nishnabotna River in Cass County, Iowa. It was built in 1951, so it is 74 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. Its operating status is: posted for load restriction.
It carries about 131 vehicles a day, projected to reach 131 by 2044. The structure is 213 ft (64.9 m) long and 22 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was FM - Boston over Nishnabotna River built?
It was built in 1951, making it 74 years old in 2025.
What condition is FM - Boston over Nishnabotna 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 March 2024.
How much traffic does FM - Boston over Nishnabotna River carry?
About 131 vehicles per day (2022 count).
How long is FM - Boston over Nishnabotna River?
The structure is 213 ft (64.9 m) long with a longest span of 82 ft (25 m) and a deck 22 ft wide.
Who owns FM - Boston over Nishnabotna River?
It is owned by the County Highway Agency.