Coonhill Road over Portage River Drain
FairJackson County, Michigan · 2 MI South of Munith · Structure no. 000000000004484
- Built
- 1975
- 50 years old
- Condition
- Fair
- inspected May 2023
- Type
- Slab
- Wood or Timber
- Length
- 52 ft
- 2 main spans
- Daily traffic
- 900
- 2003 count
- Owner
- County
- County Highway Agency
About this bridge
Coonhill Road over Portage River Drain is a wood or timber slab carrying Coonhill Road over Portage River Drain in Jackson County, Michigan. It was built in 1975, so it is 50 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 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 900 vehicles a day, projected to reach 1,050 by 2020. The structure is 52 ft (15.8 m) long and 33 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 | 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 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 Coonhill Road over Portage River Drain built?
It was built in 1975, making it 50 years old in 2025.
What condition is Coonhill Road over Portage River Drain 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 Coonhill Road over Portage River Drain carry?
About 900 vehicles per day (2003 count).
How long is Coonhill Road over Portage River Drain?
The structure is 52 ft (15.8 m) long with a longest span of 25 ft (7.6 m) and a deck 33 ft wide.
Who owns Coonhill Road over Portage River Drain?
It is owned by the County Highway Agency.