Is 83 Nbr over Thornton Mill Road
FairBaltimore County, Maryland · 0.9 M S of Br No 0305500 · Structure no. 100000030056011
- Built
- 1953
- 72 years old, rebuilt 1989
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 111 ft
- 3 main spans
- Daily traffic
- 60,263
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
Is 83 Nbr over Thornton Mill Road is a steel continuous stringer/multi-beam or girder carrying Is 83 Nbr over Thornton Mill Road in Baltimore County, Maryland. It was built in 1953 and reconstructed in 1989, so it is 72 years old, older than the Maryland average of 52.6 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 60,263 vehicles a day, roughly 8% of them trucks, projected to reach 36,050 by 2026. The structure is 111 ft (33.8 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
No coordinates are recorded for this structure.
Condition 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Is 83 Nbr over Thornton Mill Road built?
It was built in 1953, making it 72 years old in 2025. It was reconstructed in 1989.
What condition is Is 83 Nbr over Thornton Mill Road 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 Is 83 Nbr over Thornton Mill Road carry?
About 60,263 vehicles per day (2009 count), of which roughly 8% are trucks.
How long is Is 83 Nbr over Thornton Mill Road?
The structure is 111 ft (33.8 m) long with a longest span of 42 ft (12.8 m) and a deck 41 ft wide.
Who owns Is 83 Nbr over Thornton Mill Road?
It is owned by the State Highway Agency.