M-18|LAKE ST over S Br Au Sable River
FairRoscommon County, Michigan · E Lts of Roscommon · Structure no. 000000000009015
- Built
- 1935
- 90 years old, rebuilt 1995
- Condition
- Fair
- inspected June 2023
- Type
- Box Beam or Girders - Single or Spread
- Prestressed Concrete
- Length
- 50 ft
- 1 main span
- Daily traffic
- 5,505
- 2018 count
- Owner
- State
- State Highway Agency
About this bridge
M-18|LAKE ST over S Br Au Sable River is a prestressed concrete box beam or girders - single or spread carrying M-18|LAKE ST over S Br Au Sable River in Roscommon County, Michigan. It was built in 1935 and reconstructed in 1995, so it is 90 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 5,505 vehicles a day, roughly 3% of them trucks, projected to reach 6,331 by 2038. The structure is 50 ft (15.2 m) long and 42 ft wide. If it were closed, the detour would be 21.7 mi (35 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 | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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-18|LAKE ST over S Br Au Sable River built?
It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1995.
What condition is M-18|LAKE ST over S Br Au Sable 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-18|LAKE ST over S Br Au Sable River carry?
About 5,505 vehicles per day (2018 count), of which roughly 3% are trucks.
How long is M-18|LAKE ST over S Br Au Sable River?
The structure is 50 ft (15.2 m) long with a longest span of 49 ft (14.8 m) and a deck 42 ft wide.
Who owns M-18|LAKE ST over S Br Au Sable River?
It is owned by the State Highway Agency.