Bay RD over I-75 SB
FairMackinac County, Michigan · 1.7 MI S of Chippewa Col · Structure no. 000000000005960
- Built
- 1963
- 62 years old
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 160 ft
- 3 main spans
- Daily traffic
- 75
- 2011 count
- Owner
- State
- State Highway Agency
About this bridge
Bay RD over I-75 SB is a steel stringer/multi-beam or girder carrying Bay RD over I-75 SB in Mackinac County, Michigan. It was built in 1963, so it is 62 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 75 vehicles a day, roughly 2% of them trucks, projected to reach 94 by 2031. The structure is 160 ft (48.7 m) long and 31 ft wide. If it were closed, the detour would be 24.2 mi (39 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Bay RD over I-75 SB built?
It was built in 1963, making it 62 years old in 2025.
What condition is Bay RD over I-75 SB 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 August 2023.
How much traffic does Bay RD over I-75 SB carry?
About 75 vehicles per day (2011 count), of which roughly 2% are trucks.
How long is Bay RD over I-75 SB?
The structure is 160 ft (48.7 m) long with a longest span of 70 ft (21.4 m) and a deck 31 ft wide.
Who owns Bay RD over I-75 SB?
It is owned by the State Highway Agency.