US 301 over Salkehatchie River Swamp
Allendale County, South Carolina · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 301 over Salkehatchie River Swamp in Allendale County, South Carolina, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1959 and reconstructed in 1969, making it 66 years old at the 2025 inventory.
- It carries about 3,000 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 45 of the 69 inventoried bridges in Allendale County rated fair (65.2%); 9 (13.0%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: deck 6 to 5, superstructure 6 to 5.
- Its most recent inspection on record is dated May 2024, 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 → (33.10985, -81.18805)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 5 | Fair condition |
| Superstructure | 6 | 5 | Fair condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete slab |
| Length | about 65 ft |
| Location | 1MI N of Ulmers |
| NBI structure number | 000000000002889 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 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 Allendale County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 278 over Duck Creek | 1922 | 6,200 | Fair |
| US 278 over Southern Railroad | 1961 | 3,500 | Fair |
| US 301 over Salkehatchie River Swamp | 1959 | 3,000 | Fair |
| US 301 over Salkehatchie River | 1937 | 3,000 | Fair |
| US 278 over Log Creek | 1945 | 2,900 | Fair |
| US 321 over Jackson Creek | 1921 | 2,100 | Fair |
All bridges nearby: Allendale County, SC bridge conditions · every bridge in Allendale County · South Carolina bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.