Base Line HWY over I-69
FairEaton County, Michigan · 2.4 MI SW of Olivet · Structure no. 000000000002251
- Built
- 1972
- 53 years old
- Condition
- Fair
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 472 ft
- 7 main spans
- Daily traffic
- 126
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
Base Line HWY over I-69 is a steel stringer/multi-beam or girder carrying Base Line HWY over I-69 in Eaton County, Michigan. It was built in 1972, so it is 53 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 126 vehicles a day, projected to reach 129 by 2040. The structure is 472 ft (144 m) long and 40 ft wide. 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 |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Base Line HWY over I-69 built?
It was built in 1972, making it 53 years old in 2025.
What condition is Base Line HWY over I-69 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 May 2023.
How much traffic does Base Line HWY over I-69 carry?
About 126 vehicles per day (2020 count).
How long is Base Line HWY over I-69?
The structure is 472 ft (144 m) long with a longest span of 93 ft (28.4 m) and a deck 40 ft wide.
Who owns Base Line HWY over I-69?
It is owned by the State Highway Agency.