70th Street over M Br Black River
PoorPosted for loadAllegan County, Michigan · Approx 0.50 MI S of 103rd · Structure no. 000000000000218
- Built
- 1971
- 54 years old
- Condition
- Poor
- inspected May 2024
- Type
- Slab
- Wood or Timber
- Length
- 104 ft
- 4 main spans
- Daily traffic
- 277
- 2020 count
- Owner
- County
- County Highway Agency
About this bridge
70th Street over M Br Black River is a wood or timber slab carrying 70th Street over M Br Black River in Allegan County, Michigan. It was built in 1971, so it is 54 years old, older than the Michigan average of 48.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.
It carries about 277 vehicles a day, roughly 7% of them trucks, projected to reach 412 by 2040. The structure is 104 ft (31.7 m) long and 30 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 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 70th Street over M Br Black River built?
It was built in 1971, making it 54 years old in 2025.
What condition is 70th Street over M Br Black River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.
How much traffic does 70th Street over M Br Black River carry?
About 277 vehicles per day (2020 count), of which roughly 7% are trucks.
How long is 70th Street over M Br Black River?
The structure is 104 ft (31.7 m) long with a longest span of 26 ft (7.9 m) and a deck 30 ft wide.
Who owns 70th Street over M Br Black River?
It is owned by the County Highway Agency.