US 178 over Six & Twenty Creek
Anderson County, South Carolina · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 178 over Six & Twenty Creek in Anderson County, South Carolina, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1962, making it 63 years old at the 2025 inventory.
- It carries about 22,300 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 314 of the 462 inventoried bridges in Anderson County rated fair (68.0%); 19 (4.1%) 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 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 → (34.56921, -82.68785)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 255 ft |
| Location | 5.1MI NW of Anderson |
| NBI structure number | 000000000003792 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | December 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 South Carolina department of transportation.
Busiest bridges in Anderson County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-85 over Big Beaver Dam Creek | 1963 | 70,400 | Fair |
| I-85 over County Road Under I-85 | 1963 | 70,200 | Fair |
| I-85 over Six & Twenty Creek | 2002 | 63,800 | Fair |
| I-85 NB over Hurricane Creek | 1962 | 54,300 | Fair |
| I-85 NB over Steel Creek | 1962 | 50,300 | Fair |
| I-85 NB over Little Beaverdam Creek | 1961 | 45,900 | Fair |
All bridges nearby: Anderson County, SC bridge conditions · every bridge in Anderson County · South Carolina bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.