Derby ST over Grand Trunk Western RR
PoorPosted for loadOakland County, Michigan · 0.9 MI W of Coolidge HWY · Structure no. 000000000008230
- Built
- 1930
- 95 years old, rebuilt 2007
- Condition
- Poor
- inspected October 2024
- Type
- Tee Beam
- Concrete
- Length
- 165 ft
- 5 main spans
- Daily traffic
- 1,952
- 1988 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Derby ST over Grand Trunk Western RR is a concrete tee beam carrying Derby ST over Grand Trunk Western RR in Oakland County, Michigan. It was built in 1930 and reconstructed in 2007, so it is 95 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 1,952 vehicles a day, roughly 5% of them trucks, projected to reach 3,002 by 2020. The structure is 165 ft (50.3 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 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 Derby ST over Grand Trunk Western RR built?
It was built in 1930, making it 95 years old in 2025. It was reconstructed in 2007.
What condition is Derby ST over Grand Trunk Western RR 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 October 2024.
How much traffic does Derby ST over Grand Trunk Western RR carry?
About 1,952 vehicles per day (1988 count), of which roughly 5% are trucks.
How long is Derby ST over Grand Trunk Western RR?
The structure is 165 ft (50.3 m) long with a longest span of 32 ft (9.7 m) and a deck 43 ft wide.
Who owns Derby ST over Grand Trunk Western RR?
It is owned by the City or Municipal Highway Agency.