Gratiot over Canal
GoodSt. Clair County, Michigan · In Port Huron · Structure no. 000000000010258
- Built
- 1955
- 70 years old
- Condition
- Good
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 54 ft
- 1 main span
- Daily traffic
- 9,072
- 2012 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Gratiot over Canal is a steel stringer/multi-beam or girder carrying Gratiot over Canal in St. Clair County, Michigan. It was built in 1955, so it is 70 years old, older than the Michigan average of 48.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 9,072 vehicles a day, roughly 8% of them trucks, projected to reach 10,000 by 2032. The structure is 54 ft (16.4 m) long and 56 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| 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 Gratiot over Canal built?
It was built in 1955, making it 70 years old in 2025.
What condition is Gratiot over Canal in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.
How much traffic does Gratiot over Canal carry?
About 9,072 vehicles per day (2012 count), of which roughly 8% are trucks.
How long is Gratiot over Canal?
The structure is 54 ft (16.4 m) long with a longest span of 52 ft (15.8 m) and a deck 56 ft wide.
Who owns Gratiot over Canal?
It is owned by the City or Municipal Highway Agency.