M-29 over Salt River
FairMacomb County, Michigan · 0.7 MI W of New Baltimore · Structure no. 000000000006127
- Built
- 1972
- 53 years old, rebuilt 2008
- Condition
- Fair
- inspected December 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 98 ft
- 3 main spans
- Daily traffic
- 37,832
- 2007 count
- Owner
- State
- State Highway Agency
About this bridge
M-29 over Salt River is a prestressed concrete stringer/multi-beam or girder carrying M-29 over Salt River in Macomb County, Michigan. It was built in 1972 and reconstructed in 2008, so it is 53 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 37,832 vehicles a day, roughly 2% of them trucks, projected to reach 38,980 by 2028. The structure is 98 ft (29.8 m) long and 78 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was M-29 over Salt River built?
It was built in 1972, making it 53 years old in 2025. It was reconstructed in 2008.
What condition is M-29 over Salt 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 December 2023.
How much traffic does M-29 over Salt River carry?
About 37,832 vehicles per day (2007 count), of which roughly 2% are trucks.
How long is M-29 over Salt River?
The structure is 98 ft (29.8 m) long with a longest span of 31 ft (9.5 m) and a deck 78 ft wide.
Who owns M-29 over Salt River?
It is owned by the State Highway Agency.