Black Rock Road over Great Seneca Creek
FairMontgomery County, Maryland · 0.7 Miles North of Md 28 · Structure no. 200000M-0047010
- Built
- 1965
- 60 years old, rebuilt 1993
- Condition
- Fair
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 74 ft
- 2 main spans
- Daily traffic
- 400
- 2024 count
- Owner
- County
- County Highway Agency
About this bridge
Black Rock Road over Great Seneca Creek is a steel stringer/multi-beam or girder carrying Black Rock Road over Great Seneca Creek in Montgomery County, Maryland. It was built in 1965 and reconstructed in 1993, so it is 60 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 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 400 vehicles a day, roughly 5% of them trucks, projected to reach 520 by 2046. The structure is 74 ft (22.6 m) long and 15 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 Black Rock Road over Great Seneca Creek built?
It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1993.
What condition is Black Rock Road over Great Seneca Creek 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 May 2024.
How much traffic does Black Rock Road over Great Seneca Creek carry?
About 400 vehicles per day (2024 count), of which roughly 5% are trucks.
How long is Black Rock Road over Great Seneca Creek?
The structure is 74 ft (22.6 m) long with a longest span of 39 ft (11.9 m) and a deck 15 ft wide.
Who owns Black Rock Road over Great Seneca Creek?
It is owned by the County Highway Agency.