Sc 377 over Black River Swamp (2)
Williamsburg County, South Carolina · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Sc 377 over Black River Swamp (2) in Williamsburg County, South Carolina, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 2008, making it 17 years old at the 2025 inventory.
- It carries about 3,700 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 77 of the 194 inventoried bridges in Williamsburg County rated good (39.7%); 12 (6.2%) 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 October 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 → (33.59359, -79.81394)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 419 ft |
| Location | 4 Mi S of Kingstree |
| NBI structure number | 000000000002273 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2024 |
| 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 Williamsburg County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Sc 527 over S.c.l. RR | 1968 | 7,700 | Fair |
| Sc 41 over Black River | 2003 | 7,400 | Good |
| Sc 41 over Horsepen Creek | 1998 | 7,400 | Good |
| Sc 41 over Black Mingo Creek | 1942 | 6,700 | Fair |
| US 52 over Smith Swamp | 1952 | 6,200 | Good |
| US 52 over Black River Swamp | 2000 | 6,100 | Good |
All bridges nearby: Williamsburg County, SC bridge conditions · every bridge in Williamsburg County · South Carolina bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.