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S-46-31 over U.S. 21

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

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

S-46-31 over U.S. 21 in York 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 superstructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1965, making it 60 years old at the 2025 inventory.
It carries about 4,000 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 22 of the 288 inventoried bridges in York County rated poor (7.6%); 22 (7.6%) 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


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 226 ft
Location	4.6 Mi SE Rock Hill
NBI structure number	000000000004680
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
I-77 over Steel Creek	1973	130,800	Fair
I-77 over S-46-1441	1973	130,800	Fair
I-77 over S-46-100	1973	125,800	Fair
I-77 over Catawba River	1973	124,700	Fair
I-77 over US 21	1973	92,100	Fair
I-77 over Trib-catawba River	1975	92,100	Fair