French Line Road over Duff Drain
FairSanilac County, Michigan · Sec. 23-26 Marlette Twp. · Structure no. 000000000009560
- Built
- 2001
- 24 years old
- Condition
- Fair
- inspected April 2024
- Type
- Culvert
- Aluminum, Wrought Iron, or Cast Iron
- Length
- 25 ft
- 1 main span
- Daily traffic
- 435
- 2016 count
- Owner
- County
- County Highway Agency
About this bridge
French Line Road over Duff Drain is a aluminum, wrought iron, or cast iron culvert carrying French Line Road over Duff Drain in Sanilac County, Michigan. It was built in 2001, so it is 24 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 435 vehicles a day, roughly 10% of them trucks, projected to reach 785 by 2036. The structure is 25 ft (7.7 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 French Line Road over Duff Drain built?
It was built in 2001, making it 24 years old in 2025.
What condition is French Line Road over Duff Drain 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 April 2024.
How much traffic does French Line Road over Duff Drain carry?
About 435 vehicles per day (2016 count), of which roughly 10% are trucks.
How long is French Line Road over Duff Drain?
The structure is 25 ft (7.7 m) long with a longest span of 25 ft (7.7 m).
Who owns French Line Road over Duff Drain?
It is owned by the County Highway Agency.