US 340 over Potomac River CSX Trans
Washington County, Maryland · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 340 over Potomac River CSX Trans in Washington County, Maryland, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1946 and reconstructed in 1978, making it 79 years old at the 2025 inventory.
- It carries about 20,830 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 202 of the 300 inventoried bridges in Washington County rated fair (67.3%); 13 (4.3%) 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 December 2023, on a 18-month routine inspection cycle.
- It has fracture-critical members (NBI item 92A): steel tension members without a redundant load path, which get their own scheduled inspections.
- 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 → (39.32109, -77.70991)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous steel deck truss |
| Length | about 2,250 ft |
| Location | on Virginia State Line |
| NBI structure number | 100000210041010 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | December 2023 |
| Inspection interval (item 91) | 18 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Maryland department of transportation.
Busiest bridges in Washington County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Is 81 SB over CSX Trans. | 1964 | 93,204 | Fair |
| Is 70 EB over Beaver Creek | 1968 | 72,140 | Fair |
| Is 70 WB over Beaver Creek | 1966 | 72,140 | Fair |
| Is 70 EB over Crystal Falls Drive | 2024 | 70,975 | Good |
| Is 81 over Trib to Semple Run | 1965 | 68,040 | Fair |
| Is 81 NB over Maugansville Road | 1958 | 63,000 | Fair |
All bridges nearby: Washington County, MD bridge conditions · every bridge in Washington County · Maryland bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.