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S-406 Tarpon Blvd over Fripp Inlet

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

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

S-406 Tarpon Blvd over Fripp Inlet in Beaufort 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 5 (fair condition) on the 0-9 scale.
It was built in 1963 and reconstructed in 2020, making it 62 years old at the 2025 inventory.
It carries about 200 vehicles a day (traffic count year 2023).
It is one of 40 of the 72 inventoried bridges in Beaufort County rated fair (55.6%); 4 (5.6%) 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	Prestressed concrete stringer or multi-beam girder
Length	about 1,990 ft
Location	Fripp Island
NBI structure number	000000000010808
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 278 EB over Okatie River	1991	33,950	Fair
US 278 EB over Sc 170	1991	33,950	Good
US 278 WB over Okatie River	1991	33,950	Fair
US 278 WB over Sc 170	1991	33,950	Good
US 21/RIBAUT Rd over Battery Creek Overflow	1993	32,900	Fair
US 21 over Battery Creek	1994	32,900	Fair