7th Street over Black River
FairSt. Clair County, Michigan · In Port Huron · Structure no. 000000000010256
- Built
- 1933
- 92 years old, rebuilt 2007
- Condition
- Fair
- inspected October 2024
- Type
- Movable - Bascule
- Steel
- Length
- 272 ft
- 1 main span
- Daily traffic
- 9,076
- 2012 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
7th Street over Black River is a steel movable - bascule carrying 7th Street over Black River in St. Clair County, Michigan. It was built in 1933 and reconstructed in 2007, so it is 92 years old, older 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 9,076 vehicles a day, roughly 15% of them trucks, projected to reach 10,500 by 2032. The structure is 272 ft (83 m) long and 57 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 7th Street over Black River built?
It was built in 1933, making it 92 years old in 2025. It was reconstructed in 2007.
What condition is 7th Street over Black 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 October 2024.
How much traffic does 7th Street over Black River carry?
About 9,076 vehicles per day (2012 count), of which roughly 15% are trucks.
How long is 7th Street over Black River?
The structure is 272 ft (83 m) long with a longest span of 115 ft (35 m) and a deck 57 ft wide.
Who owns 7th Street over Black River?
It is owned by the City or Municipal Highway Agency.