US 378 over Simmons Branch
McCormick County, South Carolina · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 378 over Simmons Branch in McCormick County, South 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 1959, making it 66 years old at the 2025 inventory.
- It carries about 1,400 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 27 of the 68 inventoried bridges in McCormick County rated good (39.7%); 3 (4.4%) 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 June 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 → (33.91889, -82.28056)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 7 | 7 | Good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 26 ft |
| Location | 0.8MI NE of Mccormick |
| NBI structure number | 000000000003037 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | June 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 South Carolina department of transportation.
Busiest bridges in McCormick County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Sc 28 over Savannah River | 1929 | 4,600 | Fair |
| Sc 28 over CSX Rail Road | 1987 | 4,200 | Good |
| US 221 over Rocky Creek | 1941 | 3,300 | Fair |
| US 221 over Simmons Branch | 1942 | 3,300 | Fair |
| US 378 over Little River | 2017 | 2,700 | Good |
| US 378/GA SR 43 over Savannah River | 2016 | 2,700 | Good |
All bridges nearby: McCormick County, SC bridge conditions · every bridge in McCormick County · South Carolina bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.