Grassmere Road over Pinnebog River
PoorPosted for loadHuron County, Michigan · Sec. 30 Colfax Twp · Structure no. 000000000003586
- Built
- 1929
- 96 years old
- Condition
- Poor
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 42 ft
- 1 main span
- Daily traffic
- 150
- 2009 count
- Owner
- County
- County Highway Agency
About this bridge
Grassmere Road over Pinnebog River is a steel stringer/multi-beam or girder carrying Grassmere Road over Pinnebog River in Huron County, Michigan. It was built in 1929, so it is 96 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 150 vehicles a day, roughly 2% of them trucks, projected to reach 270 by 2029. The structure is 42 ft (12.8 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Grassmere Road over Pinnebog River built?
It was built in 1929, making it 96 years old in 2025.
What condition is Grassmere Road over Pinnebog 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 September 2024.
How much traffic does Grassmere Road over Pinnebog River carry?
About 150 vehicles per day (2009 count), of which roughly 2% are trucks.
How long is Grassmere Road over Pinnebog River?
The structure is 42 ft (12.8 m) long with a longest span of 38 ft (11.5 m) and a deck 36 ft wide.
Who owns Grassmere Road over Pinnebog River?
It is owned by the County Highway Agency.