US421 over Trib.of Thornton Crk
Harnett County, North Carolina · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US421 over Trib.of Thornton Crk in Harnett County, North Carolina, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
- It was built in 1945, making it 80 years old at the 2025 inventory.
- It carries about 11,000 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 82 of the 137 inventoried bridges in Harnett County rated good (59.9%); 5 (3.6%) 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 March 2024, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (35.37507, -78.71066)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 20 ft |
| Location | 0.2 Mi. S. Jct. SR2077 |
| NBI structure number | 000000000850256 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 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 North Carolina department of transportation.
Busiest bridges in Harnett County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I95 over Stoney Run | 1965 | 51,500 | Fair |
| I95N over US421 NC55 | 1955 | 25,500 | Fair |
| I95S over US421 NC55 | 1955 | 25,500 | Poor |
| NC87 over Gum Swamp | 1928 | 24,500 | Fair |
| NC87 over Cypress Creek | 1928 | 24,500 | Fair |
| US421 NC27 over West Buies Creek | 1958 | 18,000 | Good |
All bridges nearby: Harnett County, NC bridge conditions · every bridge in Harnett County · North Carolina bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.