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S-18-610/alonzo Rd over Gum Branch

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

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

S-18-610/alonzo Rd over Gum Branch in Dorchester 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 deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1988, making it 37 years old at the 2025 inventory.
It carries about 500 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 138 of the 199 inventoried bridges in Dorchester County rated fair (69.3%); 4 (2.0%) 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

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

Bridge	Built	Vehicles/day	Condition
I-95 over Polk Swamp	1974	50,100	Fair
Sc 642 over Eagle Creek	1956	40,300	Fair
Sc 642 over Dorchester Creek	1956	37,200	Fair
Sc 165 over Julia Creek	1997	34,500	Fair
Sc 165 over RR NS & S-10-65	1998	34,500	Good
S-18-230/ladson Rd over Chandler Bridge Creek	2004	30,600	Good