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US 301 over Black Swamp (no. 4)

Clarendon County, South Carolina · rated Good in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

US 301 over Black Swamp (no. 4) in Clarendon County, South Carolina, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
It was built in 2017, making it 8 years old at the 2025 inventory.
It carries about 1,700 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 31 of the 170 inventoried bridges in Clarendon County rated good (18.2%); 7 (4.1%) are rated poor.
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.

Component ratings


Structure	Prestressed concrete multiple box beam
Length	about 140 ft
Location	8MI N of Manning
NBI structure number	000000000001940
Condition class	Good

Source: FHWA National Bridge Inventory, 2025 data as reported by the South Carolina department of transportation.

Bridge	Built	Vehicles/day	Condition
I-95 over Tawcaw Creek	1967	35,400	Fair
I-95 NB over Lake Marion	1968	19,800	Fair
I-95 NB over Lake Marion Relief	1968	19,800	Fair
I-95 NB over US 15	1968	19,800	Fair
I-95 SB over Lake Marion	1968	19,800	Fair
I-95 SB over Lake Marion Relief	1968	19,800	Fair