ST Clair Road over Birch Creek
FairSanilac County, Michigan · Sec 31-36 Worth Twp · Structure no. 000000000009668
- Built
- 1970
- 55 years old
- Condition
- Fair
- inspected June 2024
- Type
- Culvert
- Steel
- Length
- 31 ft
- 3 main spans
- Daily traffic
- 250
- 2010 count
- Owner
- County
- County Highway Agency
About this bridge
ST Clair Road over Birch Creek is a steel culvert carrying ST Clair Road over Birch Creek in Sanilac County, Michigan. It was built in 1970, so it is 55 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 250 vehicles a day, roughly 10% of them trucks, projected to reach 450 by 2030. The structure is 31 ft (9.3 m) long. 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 |
|---|---|---|
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was ST Clair Road over Birch Creek built?
It was built in 1970, making it 55 years old in 2025.
What condition is ST Clair Road over Birch Creek 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 June 2024.
How much traffic does ST Clair Road over Birch Creek carry?
About 250 vehicles per day (2010 count), of which roughly 10% are trucks.
How long is ST Clair Road over Birch Creek?
The structure is 31 ft (9.3 m) long with a longest span of 9 ft (2.6 m).
Who owns ST Clair Road over Birch Creek?
It is owned by the County Highway Agency.