US-31 NB over ST Joseph River
FairBerrien County, Michigan · 2.0 MI W of Niles · Structure no. 000000000000890
- Built
- 1984
- 41 years old
- Condition
- Fair
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 1,509 ft
- 6 main spans
- Daily traffic
- 7,675
- 2015 count
- Owner
- State
- State Highway Agency
About this bridge
US-31 NB over ST Joseph River is a steel continuous stringer/multi-beam or girder carrying US-31 NB over ST Joseph River in Berrien County, Michigan. It was built in 1984, so it is 41 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 7,675 vehicles a day, roughly 15% of them trucks, projected to reach 8,826 by 2035. The structure is 1,509 ft (460 m) long and 48 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 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 | 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. |
| 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 US-31 NB over ST Joseph River built?
It was built in 1984, making it 41 years old in 2025.
What condition is US-31 NB over ST Joseph 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 May 2024.
How much traffic does US-31 NB over ST Joseph River carry?
About 7,675 vehicles per day (2015 count), of which roughly 15% are trucks.
How long is US-31 NB over ST Joseph River?
The structure is 1,509 ft (460 m) long with a longest span of 297 ft (90.5 m) and a deck 48 ft wide.
Who owns US-31 NB over ST Joseph River?
It is owned by the State Highway Agency.