US Bridges

US 521 over Trib to Pocotaligo River

Fair

Sumter County, South Carolina · 6 MI S of Sumter · Structure no. 000000000001152

Built
1940
85 years old, rebuilt 2009
Condition
Fair
inspected March 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
10,400
2023 count
Owner
State
State Highway Agency

About this bridge

US 521 over Trib to Pocotaligo River is a concrete culvert carrying US 521 over Trib to Pocotaligo River in Sumter County, South Carolina. It was built in 1940 and reconstructed in 2009, so it is 85 years old, older than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 10,400 vehicles a day, roughly 7% of them trucks, projected to reach 19,344 by 2043. The structure is 21 ft (6.4 m) long and 104 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS 521
CrossesTrib to Pocotaligo River
Location6 MI S of Sumter
RouteU.S. Route 521
CountySumter County
StateSouth Carolina
Coordinates33.85234, -80.30738
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.5 US tons
Inventory rating25.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width104 ft (31.7 m)
Roadway width90 ft (27.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,400 (2023)
Projected traffic19,344 by 2043
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 521 over Trib to Pocotaligo River built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 2009.

What condition is US 521 over Trib to Pocotaligo River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2024.

How much traffic does US 521 over Trib to Pocotaligo River carry?

About 10,400 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 521 over Trib to Pocotaligo River?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 104 ft wide.

Who owns US 521 over Trib to Pocotaligo River?

It is owned by the State Highway Agency.