Tyndall Road over Big Sable River
PoorPosted for loadMason County, Michigan · 7 MI E of Fountain · Structure no. 000000000006679
- Built
- 1900
- 125 years old, rebuilt 1974
- Condition
- Poor
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 31 ft
- 1 main span
- Daily traffic
- 200
- 1997 count
- Owner
- County
- County Highway Agency
About this bridge
Tyndall Road over Big Sable River is a steel stringer/multi-beam or girder carrying Tyndall Road over Big Sable River in Mason County, Michigan. It was built in 1900 and reconstructed in 1974, so it is 125 years old, older than the Michigan average of 48.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.
It carries about 200 vehicles a day, roughly 7% of them trucks, projected to reach 250 by 2017. The structure is 31 ft (9.3 m) long and 21 ft wide. If it were closed, the detour would be 8.7 mi (14 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Tyndall Road over Big Sable River built?
It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1974.
What condition is Tyndall Road over Big Sable River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.
How much traffic does Tyndall Road over Big Sable River carry?
About 200 vehicles per day (1997 count), of which roughly 7% are trucks.
How long is Tyndall Road over Big Sable River?
The structure is 31 ft (9.3 m) long with a longest span of 30 ft (9 m) and a deck 21 ft wide.
Who owns Tyndall Road over Big Sable River?
It is owned by the County Highway Agency.