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Sc 421 over Stream

Aiken County, South Carolina · rated Poor in the 2025 National Bridge Inventory

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

Sc 421 over Stream in Aiken County, South Carolina, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 4 (poor condition) on the 0-9 scale.
It was built in 1927 and reconstructed in 1963, making it 98 years old at the 2025 inventory.
It carries about 5,700 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 20 of the 198 inventoried bridges in Aiken County rated poor (10.1%); 20 (10.1%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings

Component	Rating (2025)	FHWA scale meaning
Culvert	4	Poor condition

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

Bridge	Built	Vehicles/day	Condition
I-20 over Savannah River	2021	64,300	Good
I-20 over Fox Creek	1966	50,200	Fair
I-20 over High Tower Branch	1966	44,500	Fair
I-20 over Horse Creek	1966	44,500	Fair
US 25 over I-20	2009	37,300	Good
US 1 over Southern RR (no 1)	1952	27,000	Fair