US Bridges

Sc 261 over Mill Branch

Fair

Williamsburg County, South Carolina · 9 MI W Kingstree · Structure no. 000000000000469

Built
1930
95 years old, rebuilt 1968
Condition
Fair
inspected November 2024
Type
Tee Beam
Concrete
Length
75 ft
3 main spans
Daily traffic
1,650
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 261 over Mill Branch is a concrete tee beam carrying Sc 261 over Mill Branch in Williamsburg County, South Carolina. It was built in 1930 and reconstructed in 1968, so it is 95 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 1,650 vehicles a day, roughly 12% of them trucks, projected to reach 2,409 by 2043. The structure is 75 ft (22.9 m) long and 48 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSc 261
CrossesMill Branch
Location9 MI W Kingstree
RouteState Highway 261
Coordinates33.69126, -79.9905
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 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 geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33.6 US tons
Inventory rating20 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length75 ft (22.9 m)
Longest span25 ft (7.6 m)
Deck width48 ft (14.6 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,650 (2023)
Projected traffic2,409 by 2043
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Sc 261 over Mill Branch built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1968.

What condition is Sc 261 over Mill Branch 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 November 2024.

How much traffic does Sc 261 over Mill Branch carry?

About 1,650 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is Sc 261 over Mill Branch?

The structure is 75 ft (22.9 m) long with a longest span of 25 ft (7.6 m) and a deck 48 ft wide.

Who owns Sc 261 over Mill Branch?

It is owned by the State Highway Agency.