I-69 WB over Colby Lake RD
FairShiawassee County, Michigan · 1.5 MI W of Shaftsburg · Structure no. 000000000009765
- Built
- 1989
- 36 years old
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 98 ft
- 1 main span
- Daily traffic
- 20,138
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
I-69 WB over Colby Lake RD is a prestressed concrete stringer/multi-beam or girder carrying I-69 WB over Colby Lake RD in Shiawassee County, Michigan. It was built in 1989, so it is 36 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 5 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 20,138 vehicles a day, roughly 15% of them trucks, projected to reach 22,263 by 2040. The structure is 98 ft (29.8 m) long and 47 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 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 I-69 WB over Colby Lake RD built?
It was built in 1989, making it 36 years old in 2025.
What condition is I-69 WB over Colby Lake RD 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 2023.
How much traffic does I-69 WB over Colby Lake RD carry?
About 20,138 vehicles per day (2020 count), of which roughly 15% are trucks.
How long is I-69 WB over Colby Lake RD?
The structure is 98 ft (29.8 m) long with a longest span of 98 ft (29.8 m) and a deck 47 ft wide.
Who owns I-69 WB over Colby Lake RD?
It is owned by the State Highway Agency.