M-106 over Portage River Drain
GoodJackson County, Michigan · 4.7 MI SW of Ingham Col · Structure no. 000000000004388
- Built
- 1939
- 86 years old, rebuilt 2005
- Condition
- Good
- inspected August 2024
- Type
- Box Beam or Girders - Single or Spread
- Prestressed Concrete
- Length
- 45 ft
- 1 main span
- Daily traffic
- 3,180
- 2007 count
- Owner
- State
- State Highway Agency
About this bridge
M-106 over Portage River Drain is a prestressed concrete box beam or girders - single or spread carrying M-106 over Portage River Drain in Jackson County, Michigan. It was built in 1939 and reconstructed in 2005, so it is 86 years old, older than the Michigan average of 48.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 3,180 vehicles a day, roughly 6% of them trucks, projected to reach 4,652 by 2018. The structure is 45 ft (13.7 m) long and 43 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| 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 M-106 over Portage River Drain built?
It was built in 1939, making it 86 years old in 2025. It was reconstructed in 2005.
What condition is M-106 over Portage River Drain in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.
How much traffic does M-106 over Portage River Drain carry?
About 3,180 vehicles per day (2007 count), of which roughly 6% are trucks.
How long is M-106 over Portage River Drain?
The structure is 45 ft (13.7 m) long with a longest span of 44 ft (13.3 m) and a deck 43 ft wide.
Who owns M-106 over Portage River Drain?
It is owned by the State Highway Agency.