Trenton Road over Piney Run
Baltimore County, Maryland · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Trenton Road over Piney Run in Baltimore County, Maryland, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1970 and reconstructed in 1989, making it 55 years old at the 2025 inventory.
- It carries about 1,050 vehicles a day (traffic count year 2017).
- Its listed owner is the county highway agency.
- It is one of 528 of the 786 inventoried bridges in Baltimore County rated fair (67.2%); 22 (2.8%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated May 2023, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (39.57194, -76.82076)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 34 ft |
| Location | 0.8 Mi SW of Blackrock Rd |
| NBI structure number | 200000B-0069010 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Maryland department of transportation.
Busiest bridges in Baltimore County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Is 83/IS 695 over Thornton Road | 1954 | 222,500 | Fair |
| Is 695 over Md 26 | 2012 | 210,600 | Good |
| Is 695 & Belmont A over Dead Run | 1961 | 206,852 | Fair |
| Is 695 over Mta Light Rail | 1955 | 205,485 | Fair |
| Is 695 over Security Boulevard | 1961 | 203,902 | Good |
| Is 695 over Dogwood Road | 1961 | 203,902 | Fair |
All bridges nearby: Baltimore County, MD bridge conditions · every bridge in Baltimore County · Maryland bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.