US 401 over Sparrow Swamp
Darlington County, South Carolina · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 401 over Sparrow Swamp in Darlington County, South Carolina, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1937 and reconstructed in 1972, making it 88 years old at the 2025 inventory.
- It carries about 3,200 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 107 of the 173 inventoried bridges in Darlington County rated fair (61.8%); 11 (6.4%) 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 January 2025, 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 → (34.19242, -80.04176)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 226 ft |
| Location | 2MI NE of Lamar |
| NBI structure number | 000000000000783 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | January 2025 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | U: unknown foundation, not evaluated for scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Carolina department of transportation.
Busiest bridges in Darlington County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-20 over Jacks Branch | 1974 | 30,400 | Fair |
| I-95 NB over Black Creek | 2004 | 27,150 | Good |
| I-95 SB over Black Creek | 2004 | 27,150 | Good |
| US 52 over Indian Creek | 1972 | 24,000 | Fair |
| US 52 over High Hill Creek | 1924 | 19,800 | Fair |
| US 52 over High Hill Creek | 1924 | 19,800 | Fair |
All bridges nearby: Darlington County, SC bridge conditions · every bridge in Darlington County · South Carolina bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.