US Bridges

US 76 over Rocky Bluff Swamp (1)

Poor

Sumter County, South Carolina · 6 MI NE of Sumter · Structure no. 000000000001837

Built
1951
74 years old
Condition
Poor
inspected June 2024
Type
Slab
Concrete Continuous
Length
120 ft
8 main spans
Daily traffic
2,100
2023 count
Owner
State
State Highway Agency

About this bridge

US 76 over Rocky Bluff Swamp (1) is a concrete continuous slab carrying US 76 over Rocky Bluff Swamp (1) in Sumter County, South Carolina. It was built in 1951, so it is 74 years old, older than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 2,100 vehicles a day, roughly 7% of them trucks, projected to reach 2,772 by 2043. The structure is 120 ft (36.6 m) long and 34 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesUS 76
CrossesRocky Bluff Swamp (1)
Location6 MI NE of Sumter
RouteU.S. Route 76
Coordinates33.95776, -80.25597
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.9 US tons
Inventory rating23.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 15
Structure length120 ft (36.6 m)
Longest span16 ft (5 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,100 (2023)
Projected traffic2,772 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$542,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 76 over Rocky Bluff Swamp (1) built?

It was built in 1951, making it 74 years old in 2025.

What condition is US 76 over Rocky Bluff Swamp (1) in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2024.

How much traffic does US 76 over Rocky Bluff Swamp (1) carry?

About 2,100 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 76 over Rocky Bluff Swamp (1)?

The structure is 120 ft (36.6 m) long with a longest span of 16 ft (5 m) and a deck 34 ft wide.

Who owns US 76 over Rocky Bluff Swamp (1)?

It is owned by the State Highway Agency.