66th Street over N Br Black River
FairAllegan County, Michigan · Approx 0.75 MI N of 109th · Structure no. 000000000000221
- Built
- 1973
- 52 years old
- Condition
- Fair
- inspected May 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 63 ft
- 2 main spans
- Daily traffic
- 396
- 2017 count
- Owner
- County
- County Highway Agency
About this bridge
66th Street over N Br Black River is a prestressed concrete box beam or girders - multiple carrying 66th Street over N Br Black River in Allegan County, Michigan. It was built in 1973, so it is 52 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 396 vehicles a day, roughly 7% of them trucks, projected to reach 588 by 2037. The structure is 63 ft (19.2 m) long and 31 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 66th Street over N Br Black River built?
It was built in 1973, making it 52 years old in 2025.
What condition is 66th Street over N Br Black River 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 66th Street over N Br Black River carry?
About 396 vehicles per day (2017 count), of which roughly 7% are trucks.
How long is 66th Street over N Br Black River?
The structure is 63 ft (19.2 m) long with a longest span of 31 ft (9.4 m) and a deck 31 ft wide.
Who owns 66th Street over N Br Black River?
It is owned by the County Highway Agency.