US-23 SB over Shiawassee River
FairGenesee County, Michigan · In Fenton · Structure no. 000000000002468
- Built
- 1957
- 68 years old
- Condition
- Fair
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 42 ft
- 1 main span
- Daily traffic
- 28,525
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
US-23 SB over Shiawassee River is a steel stringer/multi-beam or girder carrying US-23 SB over Shiawassee River in Genesee County, Michigan. It was built in 1957, so it is 68 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 28,525 vehicles a day, roughly 9% of them trucks, projected to reach 31,838 by 2041. The structure is 42 ft (12.8 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 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-23 SB over Shiawassee River built?
It was built in 1957, making it 68 years old in 2025.
What condition is US-23 SB over Shiawassee 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 March 2024.
How much traffic does US-23 SB over Shiawassee River carry?
About 28,525 vehicles per day (2019 count), of which roughly 9% are trucks.
How long is US-23 SB over Shiawassee River?
The structure is 42 ft (12.8 m) long with a longest span of 42 ft (12.8 m) and a deck 47 ft wide.
Who owns US-23 SB over Shiawassee River?
It is owned by the State Highway Agency.