Trinity Pkwy over Trib. of Big Rock Run
Fairfax County, Virginia · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Trinity Pkwy over Trib. of Big Rock Run in Fairfax County, Virginia, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1989, making it 36 years old at the 2025 inventory.
- It carries about 14,812 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 345 of the 752 inventoried bridges in Fairfax County rated fair (45.9%); 6 (0.8%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated good in the 2024 inventory and is now fair (culvert 7 to 6).
- Its most recent inspection on record is dated December 2024, 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 → (38.83952, -77.44118)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 7 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 26 ft |
| Location | 00.07fr29 00.40to wood |
| NBI structure number | 000000000030736 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | December 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Virginia department of transportation.
Busiest bridges in Fairfax County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ramp Ok-e over I-95; Rmps Ok-s;f-s;h-s | 2000 | 281,966 | Good |
| Shirley Mem. Hiway over Accotink Creek | 1993 | 232,853 | Fair |
| Shirley Highway over Pohick Creek | 1994 | 232,853 | Fair |
| I-495 over NS Railway | 1961 | 227,699 | Fair |
| Capital Beltway over Rte 2652 (heming Ave) | 1961 | 227,699 | Fair |
| Nb-95; Hov & Sb-95 over Lorton Road & Route 642 | 1995 | 218,183 | Fair |
All bridges nearby: Fairfax County, VA bridge conditions · every bridge in Fairfax County · Virginia bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.