US Bridges

S-6-121 over Trib to Lower Three Runs

Good

Barnwell County, South Carolina · 8 MI SW Barnwell · Structure no. 000000000004936

Built
2006
19 years old
Condition
Good
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
50 ft
1 main span
Daily traffic
75
2023 count
Owner
State
State Highway Agency

About this bridge

S-6-121 over Trib to Lower Three Runs is a prestressed concrete box beam or girders - multiple carrying S-6-121 over Trib to Lower Three Runs in Barnwell County, South Carolina. It was built in 2006, so it is 19 years old, younger than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 75 vehicles a day, projected to reach 96 by 2043. The structure is 50 ft (15.2 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesS-6-121
CrossesTrib to Lower Three Runs
Location8 MI SW Barnwell
RouteState Highway 121
Coordinates33.15201, -81.44908
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating47.2 US tons
Inventory rating36.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span50 ft (15.2 m)
Deck width36 ft (11 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2023)
Projected traffic96 by 2043
Trucks0%
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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was S-6-121 over Trib to Lower Three Runs built?

It was built in 2006, making it 19 years old in 2025.

What condition is S-6-121 over Trib to Lower Three Runs in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does S-6-121 over Trib to Lower Three Runs carry?

About 75 vehicles per day (2023 count).

How long is S-6-121 over Trib to Lower Three Runs?

The structure is 50 ft (15.2 m) long with a longest span of 50 ft (15.2 m) and a deck 36 ft wide.

Who owns S-6-121 over Trib to Lower Three Runs?

It is owned by the State Highway Agency.