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I-520 over Savannah River Overflow

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

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

I-520 over Savannah River Overflow in Aiken County, South Carolina, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 2004, making it 21 years old at the 2025 inventory.
It carries about 19,200 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 114 of the 198 inventoried bridges in Aiken County rated fair (57.6%); 20 (10.1%) are rated poor.
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.

Component ratings


Structure	Continuous prestressed concrete stringer or multi-beam girder
Length	about 500 ft
Location	North Augusta
NBI structure number	000000000009845
Condition class	Fair

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