US-31 NB over US-12
FairBerrien County, Michigan · 2.0 MI SW of Niles · Structure no. 000000000000888
- Built
- 1978
- 47 years old
- Condition
- Fair
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 246 ft
- 2 main spans
- Daily traffic
- 9,550
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
US-31 NB over US-12 is a steel stringer/multi-beam or girder carrying US-31 NB over US-12 in Berrien County, Michigan. It was built in 1978, so it is 47 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 6 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 9,550 vehicles a day, roughly 14% of them trucks, projected to reach 10,600 by 2040. The structure is 246 ft (75 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US-31 NB over US-12 built?
It was built in 1978, making it 47 years old in 2025.
What condition is US-31 NB over US-12 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 May 2024.
How much traffic does US-31 NB over US-12 carry?
About 9,550 vehicles per day (2019 count), of which roughly 14% are trucks.
How long is US-31 NB over US-12?
The structure is 246 ft (75 m) long with a longest span of 123 ft (37.5 m) and a deck 56 ft wide.
Who owns US-31 NB over US-12?
It is owned by the State Highway Agency.