M-20 over Chippewa River
FairMidland County, Michigan · 1.7 MI E of Isabella Col · Structure no. 000000000006889
- Built
- 1940
- 85 years old, rebuilt 1996
- Condition
- Fair
- inspected June 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 107 ft
- 2 main spans
- Daily traffic
- 14,220
- 2007 count
- Owner
- State
- State Highway Agency
About this bridge
M-20 over Chippewa River is a prestressed concrete box beam or girders - multiple carrying M-20 over Chippewa River in Midland County, Michigan. It was built in 1940 and reconstructed in 1996, so it is 85 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 14,220 vehicles a day, roughly 3% of them trucks, projected to reach 16,106 by 2018. The structure is 107 ft (32.6 m) long and 86 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 M-20 over Chippewa River built?
It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1996.
What condition is M-20 over Chippewa 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 June 2023.
How much traffic does M-20 over Chippewa River carry?
About 14,220 vehicles per day (2007 count), of which roughly 3% are trucks.
How long is M-20 over Chippewa River?
The structure is 107 ft (32.6 m) long with a longest span of 60 ft (18.2 m) and a deck 86 ft wide.
Who owns M-20 over Chippewa River?
It is owned by the State Highway Agency.