US-31 SB over CSX RR
FairMason County, Michigan · 3.1 MI E of Ludington · Structure no. 000000000006648
- Built
- 1988
- 37 years old
- Condition
- Fair
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 141 ft
- 3 main spans
- Daily traffic
- 2,498
- 2007 count
- Owner
- State
- State Highway Agency
About this bridge
US-31 SB over CSX RR is a prestressed concrete stringer/multi-beam or girder carrying US-31 SB over CSX RR in Mason County, Michigan. It was built in 1988, so it is 37 years old, younger than the Michigan average of 48.3 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 2,498 vehicles a day, roughly 15% of them trucks, projected to reach 3,385 by 2018. The structure is 141 ft (42.9 m) long and 58 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 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 US-31 SB over CSX RR built?
It was built in 1988, making it 37 years old in 2025.
What condition is US-31 SB over CSX RR 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 US-31 SB over CSX RR carry?
About 2,498 vehicles per day (2007 count), of which roughly 15% are trucks.
How long is US-31 SB over CSX RR?
The structure is 141 ft (42.9 m) long with a longest span of 47 ft (14.3 m) and a deck 58 ft wide.
Who owns US-31 SB over CSX RR?
It is owned by the State Highway Agency.