US-45 over Baltimore River
FairOntonagon County, Michigan · 7.4 MI N of M-28 · Structure no. 000000000008499
- Built
- 1934
- 91 years old
- Condition
- Fair
- inspected June 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 60 ft
- 1 main span
- Daily traffic
- 1,122
- 2007 count
- Owner
- State
- State Highway Agency
About this bridge
US-45 over Baltimore River is a steel stringer/multi-beam or girder carrying US-45 over Baltimore River in Ontonagon County, Michigan. It was built in 1934, so it is 91 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 1,122 vehicles a day, roughly 10% of them trucks, projected to reach 1,400 by 2027. The structure is 60 ft (18.3 m) long and 30 ft wide. If it were closed, the detour would be 34.8 mi (56 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 US-45 over Baltimore River built?
It was built in 1934, making it 91 years old in 2025.
What condition is US-45 over Baltimore 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 2024.
How much traffic does US-45 over Baltimore River carry?
About 1,122 vehicles per day (2007 count), of which roughly 10% are trucks.
How long is US-45 over Baltimore River?
The structure is 60 ft (18.3 m) long with a longest span of 58 ft (17.8 m) and a deck 30 ft wide.
Who owns US-45 over Baltimore River?
It is owned by the State Highway Agency.