Mo 171 S over Mna RR
PoorJasper County, Missouri · S 17 T 28 N R 32 W · Structure no. 6181
- Built
- 1949
- 76 years old, rebuilt 1977
- Condition
- Poor
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 245 ft
- 4 main spans
- Daily traffic
- 9,767
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Mo 171 S over Mna RR is a steel continuous stringer/multi-beam or girder carrying Mo 171 S over Mna RR in Jasper County, Missouri. It was built in 1949 and reconstructed in 1977, so it is 76 years old, older than the Missouri average of 45.1 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 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 9,767 vehicles a day, roughly 17% of them trucks, projected to reach 15,139 by 2044. The structure is 245 ft (74.7 m) long and 32 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 | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mo 171 S over Mna RR built?
It was built in 1949, making it 76 years old in 2025. It was reconstructed in 1977.
What condition is Mo 171 S over Mna RR 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 August 2023.
How much traffic does Mo 171 S over Mna RR carry?
About 9,767 vehicles per day (2024 count), of which roughly 17% are trucks.
How long is Mo 171 S over Mna RR?
The structure is 245 ft (74.7 m) long with a longest span of 69 ft (20.9 m) and a deck 32 ft wide.
Who owns Mo 171 S over Mna RR?
It is owned by the State Highway Agency.